Merge pull request #1081 from andrasio/test-extract

Start test organization facelift.

Cargo.lock

@@ -2000,6 +2000,7 @@ dependencies = [
  "tempfile",
  "term",
  "termcolor",
+ "test-support",
  "textwrap",
  "toml 0.5.5",
  "trash",
@@ -3408,6 +3409,17 @@ dependencies = [
  "wincolor",
 ]
 
+[[package]]
+name = "test-support"
+version = "0.1.0"
+dependencies = [
+ "app_dirs",
+ "dunce",
+ "getset",
+ "glob",
+ "tempfile",
+]
+
 [[package]]
 name = "textwrap"
 version = "0.11.0"

Cargo.toml

@@ -158,6 +158,7 @@ features = ["bundled", "blob"]
 
 [dev-dependencies]
 pretty_assertions = "0.6.1"
+test-support = { version = "0.1.0", path = "./crates/test-support" }
 
 [build-dependencies]
 toml = "0.5.5"

crates/test-support/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "test-support"
+version = "0.1.0"
+authors = ["Yehuda Katz <wycats@gmail.com>", "Jonathan Turner <jonathan.d.turner@gmail.com>", "Andrés N. Robalino <andres@androbtech.com>"]
+edition = "2018"
+description = "A source string characterizer for Nushell"
+license = "MIT"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+app_dirs = "1.2.1"
+dunce = "1.0.0"
+getset = "0.0.9"
+glob = "0.3.0"
+tempfile = "3.1.0"

crates/test-support/src/fs.rs

@@ -0,0 +1,228 @@
+use std::io::Read;
+use std::ops::Div;
+use std::path::{Path, PathBuf};
+
+pub struct AbsoluteFile {
+    inner: PathBuf,
+}
+
+impl AbsoluteFile {
+    pub fn new(path: impl AsRef<Path>) -> AbsoluteFile {
+        let path = path.as_ref();
+
+        if !path.is_absolute() {
+            panic!(
+                "AbsoluteFile::new must take an absolute path :: {}",
+                path.display()
+            )
+        } else if path.is_dir() {
+            // At the moment, this is not an invariant, but rather a way to catch bugs
+            // in tests.
+            panic!(
+                "AbsoluteFile::new must not take a directory :: {}",
+                path.display()
+            )
+        } else {
+            AbsoluteFile {
+                inner: path.to_path_buf(),
+            }
+        }
+    }
+
+    pub fn dir(&self) -> AbsolutePath {
+        AbsolutePath::new(self.inner.parent().unwrap())
+    }
+}
+
+impl From<AbsoluteFile> for PathBuf {
+    fn from(file: AbsoluteFile) -> Self {
+        file.inner
+    }
+}
+
+pub struct AbsolutePath {
+    inner: PathBuf,
+}
+
+impl AbsolutePath {
+    pub fn new(path: impl AsRef<Path>) -> AbsolutePath {
+        let path = path.as_ref();
+
+        if path.is_absolute() {
+            AbsolutePath {
+                inner: path.to_path_buf(),
+            }
+        } else {
+            panic!("AbsolutePath::new must take an absolute path")
+        }
+    }
+}
+
+impl Div<&str> for &AbsolutePath {
+    type Output = AbsolutePath;
+
+    fn div(self, rhs: &str) -> Self::Output {
+        let parts = rhs.split('/');
+        let mut result = self.inner.clone();
+
+        for part in parts {
+            result = result.join(part);
+        }
+
+        AbsolutePath::new(result)
+    }
+}
+
+impl AsRef<Path> for AbsolutePath {
+    fn as_ref(&self) -> &Path {
+        self.inner.as_path()
+    }
+}
+
+pub struct RelativePath {
+    inner: PathBuf,
+}
+
+impl RelativePath {
+    pub fn new(path: impl Into<PathBuf>) -> RelativePath {
+        let path = path.into();
+
+        if path.is_relative() {
+            RelativePath { inner: path }
+        } else {
+            panic!("RelativePath::new must take a relative path")
+        }
+    }
+}
+
+impl<T: AsRef<str>> Div<T> for &RelativePath {
+    type Output = RelativePath;
+
+    fn div(self, rhs: T) -> Self::Output {
+        let parts = rhs.as_ref().split('/');
+        let mut result = self.inner.clone();
+
+        for part in parts {
+            result = result.join(part);
+        }
+
+        RelativePath::new(result)
+    }
+}
+pub trait DisplayPath {
+    fn display_path(&self) -> String;
+}
+
+impl DisplayPath for AbsolutePath {
+    fn display_path(&self) -> String {
+        self.inner.display().to_string()
+    }
+}
+
+impl DisplayPath for PathBuf {
+    fn display_path(&self) -> String {
+        self.display().to_string()
+    }
+}
+
+impl DisplayPath for str {
+    fn display_path(&self) -> String {
+        self.to_string()
+    }
+}
+
+impl DisplayPath for &str {
+    fn display_path(&self) -> String {
+        self.to_string()
+    }
+}
+
+impl DisplayPath for String {
+    fn display_path(&self) -> String {
+        self.clone()
+    }
+}
+
+impl DisplayPath for &String {
+    fn display_path(&self) -> String {
+        self.to_string()
+    }
+}
+pub enum Stub<'a> {
+    FileWithContent(&'a str, &'a str),
+    FileWithContentToBeTrimmed(&'a str, &'a str),
+    EmptyFile(&'a str),
+}
+
+pub fn file_contents(full_path: impl AsRef<Path>) -> String {
+    let mut file = std::fs::File::open(full_path.as_ref()).expect("can not open file");
+    let mut contents = String::new();
+    file.read_to_string(&mut contents)
+        .expect("can not read file");
+    contents
+}
+
+pub fn file_contents_binary(full_path: impl AsRef<Path>) -> Vec<u8> {
+    let mut file = std::fs::File::open(full_path.as_ref()).expect("can not open file");
+    let mut contents = Vec::new();
+    file.read_to_end(&mut contents).expect("can not read file");
+    contents
+}
+
+pub fn line_ending() -> String {
+    #[cfg(windows)]
+    {
+        String::from("\r\n")
+    }
+
+    #[cfg(not(windows))]
+    {
+        String::from("\n")
+    }
+}
+
+pub fn delete_file_at(full_path: impl AsRef<Path>) {
+    let full_path = full_path.as_ref();
+
+    if full_path.exists() {
+        std::fs::remove_file(full_path).expect("can not delete file");
+    }
+}
+
+pub fn create_file_at(full_path: impl AsRef<Path>) -> Result<(), std::io::Error> {
+    let full_path = full_path.as_ref();
+
+    if let Some(parent) = full_path.parent() {
+        panic!(format!("{:?} exists", parent.display()));
+    }
+
+    std::fs::write(full_path, "fake data".as_bytes())
+}
+
+pub fn copy_file_to(source: &str, destination: &str) {
+    std::fs::copy(source, destination).expect("can not copy file");
+}
+
+pub fn files_exist_at(files: Vec<impl AsRef<Path>>, path: impl AsRef<Path>) -> bool {
+    files.iter().all(|f| {
+        let mut loc = PathBuf::from(path.as_ref());
+        loc.push(f);
+        loc.exists()
+    })
+}
+
+pub fn delete_directory_at(full_path: &str) {
+    std::fs::remove_dir_all(PathBuf::from(full_path)).expect("can not remove directory");
+}
+
+pub fn executable_path() -> PathBuf {
+    let mut buf = PathBuf::new();
+    buf.push("target");
+    buf.push("debug");
+    buf.push("nu");
+    buf
+}
+
+pub fn in_directory(str: impl AsRef<Path>) -> String {
+    str.as_ref().display().to_string()
+}

crates/test-support/src/lib.rs

@@ -0,0 +1,38 @@
+pub mod fs;
+pub mod macros;
+pub mod playground;
+
+pub fn pipeline(commands: &str) -> String {
+    commands
+        .lines()
+        .skip(1)
+        .map(|line| line.trim())
+        .collect::<Vec<&str>>()
+        .join(" ")
+        .trim_end()
+        .to_string()
+}
+
+#[cfg(tests)]
+mod tests {
+    use super::pipeline;
+
+    #[test]
+    fn constructs_a_pipeline() {
+        let actual = pipeline(
+            r#"
+                open los_tres_amigos.txt
+                | from-csv
+                | get rusty_luck
+                | str --to-int
+                | sum
+                | echo "$it"
+            "#,
+        );
+
+        assert_eq!(
+            actual,
+            r#"open los_tres_amigos.txt | from-csv | get rusty_luck | str --to-int | sum | echo "$it""#
+        );
+    }
+}

crates/test-support/src/macros.rs

@@ -0,0 +1,159 @@
+#[macro_export]
+macro_rules! nu {
+    (cwd: $cwd:expr, $path:expr, $($part:expr),*) => {{
+        use $crate::fs::DisplayPath;
+
+        let path = format!($path, $(
+            $part.display_path()
+        ),*);
+
+        nu!($cwd, &path)
+    }};
+
+    (cwd: $cwd:expr, $path:expr) => {{
+        nu!($cwd, $path)
+    }};
+
+    ($cwd:expr, $path:expr) => {{
+        pub use std::error::Error;
+        pub use std::io::prelude::*;
+        pub use std::process::{Command, Stdio};
+
+        let commands = &*format!(
+            "
+                            cd {}
+                            {}
+                            exit",
+            $crate::fs::in_directory($cwd),
+            $crate::fs::DisplayPath::display_path(&$path)
+        );
+
+        let mut process = match Command::new($crate::fs::executable_path())
+            .stdin(Stdio::piped())
+            .stdout(Stdio::piped())
+            .spawn()
+        {
+            Ok(child) => child,
+            Err(why) => panic!("Can't run test {}", why.description()),
+        };
+
+        let stdin = process.stdin.as_mut().expect("couldn't open stdin");
+        stdin
+            .write_all(commands.as_bytes())
+            .expect("couldn't write to stdin");
+
+
+        let output = process
+            .wait_with_output()
+            .expect("couldn't read from stdout");
+
+        let out = String::from_utf8_lossy(&output.stdout);
+        let out = out.replace("\r\n", "");
+        let out = out.replace("\n", "");
+        out
+    }};
+}
+
+#[macro_export]
+macro_rules! nu_error {
+    (cwd: $cwd:expr, $path:expr, $($part:expr),*) => {{
+        use $crate::fs::DisplayPath;
+
+        let path = format!($path, $(
+            $part.display_path()
+        ),*);
+
+        nu_error!($cwd, &path)
+    }};
+
+    (cwd: $cwd:expr, $path:expr) => {{
+        nu_error!($cwd, $path)
+    }};
+
+    ($cwd:expr, $path:expr) => {{
+        pub use std::error::Error;
+        pub use std::io::prelude::*;
+        pub use std::process::{Command, Stdio};
+
+        let commands = &*format!(
+            "
+                            cd {}
+                            {}
+                            exit",
+            $crate::fs::in_directory($cwd),
+            $crate::fs::DisplayPath::display_path(&$path)
+        );
+
+        let mut process = Command::new($crate::fs::executable_path())
+            .stdin(Stdio::piped())
+            .stderr(Stdio::piped())
+            .spawn()
+            .expect("couldn't run test");
+
+        let stdin = process.stdin.as_mut().expect("couldn't open stdin");
+        stdin
+            .write_all(commands.as_bytes())
+            .expect("couldn't write to stdin");
+
+        let output = process
+            .wait_with_output()
+            .expect("couldn't read from stderr");
+
+        let out = String::from_utf8_lossy(&output.stderr);
+        out.into_owned()
+    }};
+}
+
+#[macro_export]
+macro_rules! nu_combined {
+    (cwd: $cwd:expr, $path:expr, $($part:expr),*) => {{
+        use $crate::fs::DisplayPath;
+
+        let path = format!($path, $(
+            $part.display_path()
+        ),*);
+
+        nu_combined!($cwd, &path)
+    }};
+
+    (cwd: $cwd:expr, $path:expr) => {{
+        nu_combined!($cwd, $path)
+    }};
+
+    ($cwd:expr, $path:expr) => {{
+        pub use std::error::Error;
+        pub use std::io::prelude::*;
+        pub use std::process::{Command, Stdio};
+
+        let commands = &*format!(
+            "
+                            cd {}
+                            {}
+                            exit",
+            $crate::fs::in_directory($cwd),
+            $crate::fs::DisplayPath::display_path(&$path)
+        );
+
+        let mut process = Command::new($crate::fs::executable_path())
+            .stdin(Stdio::piped())
+            .stdout(Stdio::piped())
+            .stderr(Stdio::piped())
+            .spawn()
+            .expect("couldn't run test");
+
+        let stdin = process.stdin.as_mut().expect("couldn't open stdin");
+        stdin
+            .write_all(commands.as_bytes())
+            .expect("couldn't write to stdin");
+
+        let output = process
+            .wait_with_output()
+            .expect("couldn't read from stdout/stderr");
+
+        let err = String::from_utf8_lossy(&output.stderr).into_owned();
+        let out = String::from_utf8_lossy(&output.stdout).into_owned();
+        let out = out.replace("\r\n", "");
+        let out = out.replace("\n", "");
+        (out, err)
+    }};
+}

crates/test-support/src/playground.rs

@@ -0,0 +1,152 @@
+use crate::fs::line_ending;
+use crate::fs::Stub;
+
+use getset::Getters;
+use glob::glob;
+use std::path::{Path, PathBuf};
+use tempfile::{tempdir, TempDir};
+
+pub struct Playground {
+    root: TempDir,
+    tests: String,
+    cwd: PathBuf,
+}
+
+#[derive(Getters)]
+#[get = "pub"]
+pub struct Dirs {
+    pub root: PathBuf,
+    pub test: PathBuf,
+    pub fixtures: PathBuf,
+}
+
+impl Dirs {
+    pub fn formats(&self) -> PathBuf {
+        PathBuf::from(self.fixtures.join("formats"))
+    }
+}
+
+impl Playground {
+    pub fn root(&self) -> &Path {
+        self.root.path()
+    }
+
+    pub fn back_to_playground(&mut self) -> &mut Self {
+        self.cwd = PathBuf::from(self.root()).join(self.tests.clone());
+        self
+    }
+
+    pub fn setup(topic: &str, block: impl FnOnce(Dirs, &mut Playground)) {
+        let root = tempdir().expect("Couldn't create a tempdir");
+        let nuplay_dir = root.path().join(topic);
+
+        if PathBuf::from(&nuplay_dir).exists() {
+            std::fs::remove_dir_all(PathBuf::from(&nuplay_dir)).expect("can not remove directory");
+        }
+
+        std::fs::create_dir(PathBuf::from(&nuplay_dir)).expect("can not create directory");
+
+        let mut playground = Playground {
+            root: root,
+            tests: topic.to_string(),
+            cwd: nuplay_dir,
+        };
+
+        let project_root = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
+        let playground_root = playground.root.path();
+
+        let fixtures = project_root;
+        let fixtures = fixtures
+            .parent()
+            .expect("Couldn't find the fixtures directory")
+            .parent()
+            .expect("Couldn't find the fixtures directory")
+            .join("tests/fixtures");
+
+        let fixtures = dunce::canonicalize(fixtures.clone()).expect(&format!(
+            "Couldn't canonicalize fixtures path {}",
+            fixtures.display()
+        ));
+
+        let test =
+            dunce::canonicalize(PathBuf::from(playground_root.join(topic))).expect(&format!(
+                "Couldn't canonicalize test path {}",
+                playground_root.join(topic).display()
+            ));
+
+        let root = dunce::canonicalize(playground_root).expect(&format!(
+            "Couldn't canonicalize tests root path {}",
+            playground_root.display()
+        ));
+
+        let dirs = Dirs {
+            root,
+            test,
+            fixtures,
+        };
+
+        block(dirs, &mut playground);
+    }
+
+    pub fn mkdir(&mut self, directory: &str) -> &mut Self {
+        self.cwd.push(directory);
+        std::fs::create_dir_all(&self.cwd).expect("can not create directory");
+        self.back_to_playground();
+        self
+    }
+
+    pub fn with_files(&mut self, files: Vec<Stub>) -> &mut Self {
+        let endl = line_ending();
+
+        files
+            .iter()
+            .map(|f| {
+                let mut path = PathBuf::from(&self.cwd);
+
+                let (file_name, contents) = match *f {
+                    Stub::EmptyFile(name) => (name, "fake data".to_string()),
+                    Stub::FileWithContent(name, content) => (name, content.to_string()),
+                    Stub::FileWithContentToBeTrimmed(name, content) => (
+                        name,
+                        content
+                            .lines()
+                            .skip(1)
+                            .map(|line| line.trim())
+                            .collect::<Vec<&str>>()
+                            .join(&endl),
+                    ),
+                };
+
+                path.push(file_name);
+
+                std::fs::write(PathBuf::from(path), contents.as_bytes())
+                    .expect("can not create file");
+            })
+            .for_each(drop);
+        self.back_to_playground();
+        self
+    }
+
+    pub fn within(&mut self, directory: &str) -> &mut Self {
+        self.cwd.push(directory);
+        std::fs::create_dir(&self.cwd).expect("can not create directory");
+        self
+    }
+
+    pub fn glob_vec(pattern: &str) -> Vec<PathBuf> {
+        let glob = glob(pattern);
+
+        match glob {
+            Ok(paths) => paths
+                .map(|path| {
+                    if let Ok(path) = path {
+                        path
+                    } else {
+                        unreachable!()
+                    }
+                })
+                .collect(),
+            Err(_) => panic!("Invalid pattern."),
+        }
+    }
+}

src/lib.rs

@@ -26,7 +26,6 @@ pub use crate::data::dict::TaggedListBuilder;
 pub use crate::data::primitive;
 pub use crate::data::value;
 pub use crate::env::host::BasicHost;
-pub use crate::utils::{AbsoluteFile, AbsolutePath, RelativePath};
 pub use nu_parser::TokenTreeBuilder;
 pub use nu_value_ext::ValueExt;
 pub use num_traits::cast::ToPrimitive;

src/utils.rs

@@ -1,123 +1,7 @@
 use nu_errors::ShellError;
 use nu_protocol::{UntaggedValue, Value};
-use nu_source::{b, DebugDocBuilder, PrettyDebug};
-use std::ops::Div;
 use std::path::{Component, Path, PathBuf};
 
-pub struct AbsoluteFile {
-    inner: PathBuf,
-}
-
-impl AbsoluteFile {
-    pub fn new(path: impl AsRef<Path>) -> AbsoluteFile {
-        let path = path.as_ref();
-
-        if !path.is_absolute() {
-            panic!(
-                "AbsoluteFile::new must take an absolute path :: {}",
-                path.display()
-            )
-        } else if path.is_dir() {
-            // At the moment, this is not an invariant, but rather a way to catch bugs
-            // in tests.
-            panic!(
-                "AbsoluteFile::new must not take a directory :: {}",
-                path.display()
-            )
-        } else {
-            AbsoluteFile {
-                inner: path.to_path_buf(),
-            }
-        }
-    }
-
-    pub fn dir(&self) -> AbsolutePath {
-        AbsolutePath::new(self.inner.parent().unwrap())
-    }
-}
-
-impl From<AbsoluteFile> for PathBuf {
-    fn from(file: AbsoluteFile) -> Self {
-        file.inner
-    }
-}
-
-pub struct AbsolutePath {
-    inner: PathBuf,
-}
-
-impl PrettyDebug for AbsolutePath {
-    fn pretty(&self) -> DebugDocBuilder {
-        b::primitive(self.inner.display())
-    }
-}
-
-impl AbsolutePath {
-    pub fn new(path: impl AsRef<Path>) -> AbsolutePath {
-        let path = path.as_ref();
-
-        if path.is_absolute() {
-            AbsolutePath {
-                inner: path.to_path_buf(),
-            }
-        } else {
-            panic!("AbsolutePath::new must take an absolute path")
-        }
-    }
-}
-
-impl Div<&str> for &AbsolutePath {
-    type Output = AbsolutePath;
-
-    fn div(self, rhs: &str) -> Self::Output {
-        let parts = rhs.split('/');
-        let mut result = self.inner.clone();
-
-        for part in parts {
-            result = result.join(part);
-        }
-
-        AbsolutePath::new(result)
-    }
-}
-
-impl AsRef<Path> for AbsolutePath {
-    fn as_ref(&self) -> &Path {
-        self.inner.as_path()
-    }
-}
-
-pub struct RelativePath {
-    inner: PathBuf,
-}
-
-impl RelativePath {
-    pub fn new(path: impl Into<PathBuf>) -> RelativePath {
-        let path = path.into();
-
-        if path.is_relative() {
-            RelativePath { inner: path }
-        } else {
-            panic!("RelativePath::new must take a relative path")
-        }
-    }
-}
-
-impl<T: AsRef<str>> Div<T> for &RelativePath {
-    type Output = RelativePath;
-
-    fn div(self, rhs: T) -> Self::Output {
-        let parts = rhs.as_ref().split('/');
-        let mut result = self.inner.clone();
-
-        for part in parts {
-            result = result.join(part);
-        }
-
-        RelativePath::new(result)
-    }
-}
-
 pub enum TaggedValueIter<'a> {
     Empty,
     List(indexmap::map::Iter<'a, String, Value>),

tests/command_config_test.rs

@@ -1,115 +0,0 @@
-mod helpers;
-
-use helpers as h;
-use helpers::{Playground, Stub::*};
-
-use std::path::PathBuf;
-
-#[test]
-fn has_default_configuration_file() {
-    let expected = "config.toml";
-
-    Playground::setup("config_test_1", |dirs, _| {
-        nu!(cwd: dirs.root(), "config");
-
-        assert_eq!(
-            dirs.config_path().join(expected),
-            nu::config_path().unwrap().join(expected)
-        );
-    })
-}
-
-#[test]
-fn shows_path_of_configuration_file() {
-    let expected = "config.toml";
-
-    Playground::setup("config_test_2", |dirs, _| {
-        let actual = nu!(
-            cwd: dirs.test(),
-            "config --path | echo $it"
-        );
-
-        assert_eq!(PathBuf::from(actual), dirs.config_path().join(expected));
-    });
-}
-
-#[test]
-fn use_different_configuration() {
-    Playground::setup("config_test_3", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContent(
-            "test_3.toml",
-            r#"
-                    caballero_1 = "Andrés N. Robalino"
-                    caballero_2 = "Jonathan Turner"
-                    caballero_3 = "Yehuda katz"
-                "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.root(),
-            "config --get caballero_1 --load {}/test_3.toml | echo $it",
-            dirs.test()
-        );
-
-        assert_eq!(actual, "Andrés N. Robalino");
-    });
-
-    h::delete_file_at(nu::config_path().unwrap().join("test_3.toml"));
-}
-
-#[test]
-fn sets_configuration_value() {
-    Playground::setup("config_test_4", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContent(
-            "test_4.toml",
-            r#"
-                    caballero_1 = "Andrés N. Robalino"
-                    caballero_2 = "Jonathan Turner"
-                    caballero_3 = "Yehuda katz"
-                "#,
-        )]);
-
-        nu!(
-            cwd: dirs.test(),
-            "config --load test_4.toml --set [caballero_4 jonas]"
-        );
-
-        let actual = nu!(
-            cwd: dirs.root(),
-            r#"open "{}/test_4.toml" | get caballero_4 | echo $it"#,
-            dirs.config_path()
-        );
-
-        assert_eq!(actual, "jonas");
-    });
-
-    h::delete_file_at(nu::config_path().unwrap().join("test_4.toml"));
-}
-
-// #[test]
-// fn removes_configuration_value() {
-//     Playground::setup("config_test_5", |dirs, sandbox| {
-//         sandbox.with_files(vec![FileWithContent(
-//             "test_5.toml",
-//             r#"
-//                     caballeros = [1, 1, 1]
-//                     podershell = [1, 1, 1]
-//                 "#,
-//         )]);
-
-//         nu!(
-//             cwd: dirs.test(),
-//             "config --load test_5.toml --remove podershell"
-//         );
-
-//         let actual = nu_error!(
-//             cwd: dirs.root(),
-//             r#"open "{}/test_5.toml" | get podershell | echo $it"#,
-//             dirs.config_path()
-//         );
-
-//         assert!(actual.contains("Unknown column"));
-//     });
-
-//     h::delete_file_at(nu::config_path().unwrap().join("test_5.toml"));
-// }

tests/commands/append.rs

@@ -0,0 +1,17 @@
+use test_support::{nu, pipeline};
+
+#[test]
+fn adds_a_row_to_the_end() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open fileA.txt
+            | lines
+            | append "testme"
+            | nth 3
+            | echo $it
+        "#
+    ));
+
+    assert_eq!(actual, "testme");
+}

tests/commands/cd.rs

@@ -1,7 +1,7 @@
-mod helpers;
-
-use helpers::{Playground, Stub::*};
 use std::path::PathBuf;
+use test_support::fs::{Stub::EmptyFile, Stub::FileWithContent};
+use test_support::playground::Playground;
+use test_support::{nu, nu_error};
 
 #[test]
 fn filesystem_change_from_current_directory_using_relative_path() {

tests/commands/compact.rs

@@ -0,0 +1,52 @@
+use test_support::fs::Stub::FileWithContentToBeTrimmed;
+use test_support::playground::Playground;
+use test_support::{nu, pipeline};
+
+#[test]
+fn discards_rows_where_given_column_is_empty() {
+    Playground::setup("compact_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "los_tres_amigos.json",
+            r#"
+                {
+                    "amigos": [
+                        {"name":   "Yehuda", "rusty_luck": 1},
+                        {"name": "Jonathan", "rusty_luck": 1},
+                        {"name":   "Andres", "rusty_luck": 1},
+                        {"name":"GorbyPuff"}
+                    ]
+                }
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open los_tres_amigos.json
+                | get amigos
+                | compact rusty_luck
+                | count
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "3");
+    });
+}
+#[test]
+fn discards_empty_rows_by_default() {
+    Playground::setup("compact_test_2", |dirs, _| {
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                echo "[1,2,3,14,null]"
+                | from-json
+                | compact
+                | count
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "4");
+    });
+}

tests/commands/cp.rs

@@ -1,9 +1,7 @@
-mod helpers;
-
-use nu::AbsoluteFile;
-
-use helpers::{files_exist_at, Playground, Stub::*};
 use std::path::Path;
+use test_support::fs::{files_exist_at, AbsoluteFile, Stub::EmptyFile};
+use test_support::playground::Playground;
+use test_support::{nu, nu_error};
 
 #[test]
 fn copies_a_file() {

tests/commands/default.rs

@@ -0,0 +1,36 @@
+use test_support::fs::Stub::FileWithContentToBeTrimmed;
+use test_support::playground::Playground;
+use test_support::{nu, pipeline};
+
+#[test]
+fn adds_row_data_if_column_missing() {
+    Playground::setup("default_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "los_tres_amigos.json",
+            r#"
+                {
+                    "amigos": [
+                        {"name":   "Yehuda"},
+                        {"name": "Jonathan", "rusty_luck": 0},
+                        {"name":   "Andres", "rusty_luck": 0},
+                        {"name":"GorbyPuff"}
+                    ]
+                }
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open los_tres_amigos.json
+                | get amigos
+                | default rusty_luck 1
+                | where rusty_luck == 1
+                | count
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "2");
+    });
+}

tests/commands/edit.rs

@@ -0,0 +1,16 @@
+use test_support::{nu, pipeline};
+
+#[test]
+fn creates_a_new_table_with_the_new_row_given() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open cargo_sample.toml
+            | edit dev-dependencies.pretty_assertions "7"
+            | get dev-dependencies.pretty_assertions
+            | echo $it
+        "#
+    ));
+
+    assert_eq!(actual, "7");
+}

tests/commands/enter.rs

@@ -1,9 +1,7 @@
-mod helpers;
-
-use helpers as h;
-use helpers::{Playground, Stub::*};
-
 use std::path::Path;
+use test_support::fs::{files_exist_at, Stub::EmptyFile};
+use test_support::playground::Playground;
+use test_support::{nu, nu_error};
 
 #[test]
 fn knows_the_filesystems_entered() {
@@ -53,7 +51,7 @@ fn knows_the_filesystems_entered() {
         );
 
         assert!(!red_pill_dir.exists());
-        assert!(h::files_exist_at(
+        assert!(files_exist_at(
             vec![
                 Path::new("andres.nu"),
                 Path::new("jonathan.nu"),
@@ -63,7 +61,7 @@ fn knows_the_filesystems_entered() {
         ));
 
         assert!(!blue_pill_dir.exists());
-        assert!(h::files_exist_at(
+        assert!(files_exist_at(
             vec![
                 Path::new("bash.nxt"),
                 Path::new("korn.nxt"),

tests/commands/first.rs

@@ -0,0 +1,70 @@
+use test_support::fs::Stub::EmptyFile;
+use test_support::playground::Playground;
+use test_support::{nu, pipeline};
+
+#[test]
+fn gets_first_rows_by_amount() {
+    Playground::setup("first_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![
+            EmptyFile("los.txt"),
+            EmptyFile("tres.txt"),
+            EmptyFile("amigos.txt"),
+            EmptyFile("arepas.clu"),
+        ]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                ls
+                | first 3
+                | count
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "3");
+    })
+}
+
+#[test]
+fn gets_all_rows_if_amount_higher_than_all_rows() {
+    Playground::setup("first_test_2", |dirs, sandbox| {
+        sandbox.with_files(vec![
+            EmptyFile("los.txt"),
+            EmptyFile("tres.txt"),
+            EmptyFile("amigos.txt"),
+            EmptyFile("arepas.clu"),
+        ]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                ls
+                | first 99
+                | count
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "4");
+    })
+}
+
+#[test]
+fn gets_first_row_when_no_amount_given() {
+    Playground::setup("first_test_3", |dirs, sandbox| {
+        sandbox.with_files(vec![EmptyFile("caballeros.txt"), EmptyFile("arepas.clu")]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                ls
+                | first
+                | count
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "1");
+    })
+}

tests/commands/format.rs

@@ -0,0 +1,16 @@
+use test_support::{nu, pipeline};
+
+#[test]
+fn creates_the_resulting_string_from_the_given_fields() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+        open cargo_sample.toml
+            | get package
+            | format "{name} has license {license}"
+            | echo $it
+        "#
+    ));
+
+    assert_eq!(actual, "nu has license ISC");
+}

tests/commands/get.rs

@@ -1,10 +1,9 @@
-mod helpers;
-
-use helpers as h;
-use helpers::{Playground, Stub::*};
+use test_support::fs::Stub::FileWithContent;
+use test_support::playground::Playground;
+use test_support::{nu, nu_error, pipeline};
 
 #[test]
-fn get() {
+fn fetches_a_row() {
     Playground::setup("get_test_1", |dirs, sandbox| {
         sandbox.with_files(vec![FileWithContent(
             "sample.toml",
@@ -14,7 +13,7 @@ fn get() {
         )]);
 
         let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
+            cwd: dirs.test(), pipeline(
             r#"
                 open sample.toml
                 | get nu_party_venue
@@ -41,7 +40,7 @@ fn fetches_by_index() {
         )]);
 
         let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
+            cwd: dirs.test(), pipeline(
             r#"
                 open sample.toml
                 | get package.authors.2
@@ -64,7 +63,7 @@ fn fetches_by_column_path() {
         )]);
 
         let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
+            cwd: dirs.test(), pipeline(
             r#"
                 open sample.toml
                 | get package.name
@@ -89,7 +88,7 @@ fn column_paths_are_either_double_quoted_or_regular_unquoted_words_separated_by_
         )]);
 
         let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
+            cwd: dirs.test(), pipeline(
             r#"
                 open sample.toml
                 | get package."9999"
@@ -123,7 +122,7 @@ fn fetches_more_than_one_column_path() {
         )]);
 
         let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
+            cwd: dirs.test(), pipeline(
             r#"
                 open sample.toml
                 | get fortune_tellers.2.name fortune_tellers.0.name fortune_tellers.1.name
@@ -148,7 +147,7 @@ fn errors_fetching_by_column_not_present() {
         )]);
 
         let actual = nu_error!(
-            cwd: dirs.test(), h::pipeline(
+            cwd: dirs.test(), pipeline(
             r#"
                 open sample.toml
                 | get taco
@@ -173,7 +172,7 @@ fn errors_fetching_by_column_using_a_number() {
         )]);
 
         let actual = nu_error!(
-            cwd: dirs.test(), h::pipeline(
+            cwd: dirs.test(), pipeline(
             r#"
                 open sample.toml
                 | get spanish_lesson.9
@@ -196,7 +195,7 @@ fn errors_fetching_by_index_out_of_bounds() {
         )]);
 
         let actual = nu_error!(
-            cwd: dirs.test(), h::pipeline(
+            cwd: dirs.test(), pipeline(
             r#"
                 open sample.toml
                 | get spanish_lesson.sentence_words.3

tests/commands/group_by.rs

@@ -0,0 +1,56 @@
+use test_support::fs::Stub::FileWithContentToBeTrimmed;
+use test_support::playground::Playground;
+use test_support::{nu, nu_error, pipeline};
+
+#[test]
+fn groups() {
+    Playground::setup("group_by_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "los_tres_caballeros.csv",
+            r#"
+                first_name,last_name,rusty_at,type
+                Andrés,Robalino,10/11/2013,A
+                Jonathan,Turner,10/12/2013,B
+                Yehuda,Katz,10/11/2013,A
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open los_tres_caballeros.csv
+                | group-by rusty_at
+                | get "10/11/2013"
+                | count
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "2");
+    })
+}
+
+#[test]
+fn errors_if_given_unknown_column_name_is_missing() {
+    Playground::setup("group_by_test_2", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "los_tres_caballeros.csv",
+            r#"
+                first_name,last_name,rusty_at,type
+                Andrés,Robalino,10/11/2013,A
+                Jonathan,Turner,10/12/2013,B
+                Yehuda,Katz,10/11/2013,A
+            "#,
+        )]);
+
+        let actual = nu_error!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open los_tres_caballeros.csv
+                | group-by ttype
+            "#
+        ));
+
+        assert!(actual.contains("Unknown column"));
+    })
+}

tests/commands/histogram.rs

@@ -0,0 +1,32 @@
+use test_support::fs::Stub::FileWithContentToBeTrimmed;
+use test_support::playground::Playground;
+use test_support::{nu, pipeline};
+
+#[test]
+fn summarizes() {
+    Playground::setup("histogram_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "los_tres_caballeros.csv",
+            r#"
+                first_name,last_name,rusty_at
+                Andrés,Robalino,Ecuador
+                Jonathan,Turner,Estados Unidos
+                Yehuda,Katz,Estados Unidos
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open los_tres_caballeros.csv
+                | histogram rusty_at countries
+                | where rusty_at == "Ecuador"
+                | get countries
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "**************************************************");
+        // 50%
+    })
+}

tests/commands/insert.rs

@@ -0,0 +1,16 @@
+use test_support::{nu, pipeline};
+
+#[test]
+fn insert_plugin() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open cargo_sample.toml
+            | insert dev-dependencies.newdep "1"
+            | get dev-dependencies.newdep
+            | echo $it
+        "#
+    ));
+
+    assert_eq!(actual, "1");
+}

tests/commands/last.rs

@@ -0,0 +1,56 @@
+use test_support::fs::Stub::EmptyFile;
+use test_support::playground::Playground;
+use test_support::{nu, pipeline};
+
+#[test]
+fn gets_the_last_row() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats",
+        "ls | sort-by name | last 1 | get name | trim | echo $it"
+    );
+
+    assert_eq!(actual, "utf16.ini");
+}
+
+#[test]
+fn gets_last_rows_by_amount() {
+    Playground::setup("last_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![
+            EmptyFile("los.txt"),
+            EmptyFile("tres.txt"),
+            EmptyFile("amigos.txt"),
+            EmptyFile("arepas.clu"),
+        ]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                ls
+                | last 3
+                | count
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "3");
+    })
+}
+
+#[test]
+fn gets_last_row_when_no_amount_given() {
+    Playground::setup("last_test_2", |dirs, sandbox| {
+        sandbox.with_files(vec![EmptyFile("caballeros.txt"), EmptyFile("arepas.clu")]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                ls
+                | last
+                | count
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "1");
+    })
+}

tests/commands/lines.rs

@@ -0,0 +1,21 @@
+use test_support::{nu, pipeline};
+
+#[test]
+fn lines() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open cargo_sample.toml --raw
+            | lines
+            | skip-while $it != "[dependencies]"
+            | skip 1
+            | first 1
+            | split-column "="
+            | get Column1
+            | trim
+            | echo $it
+        "#
+    ));
+
+    assert_eq!(actual, "rustyline");
+}

tests/commands/ls.rs

@@ -1,10 +1,9 @@
-mod helpers;
-
-use helpers as h;
-use helpers::{Playground, Stub::*};
+use test_support::fs::Stub::EmptyFile;
+use test_support::playground::Playground;
+use test_support::{nu, pipeline};
 
 #[test]
-fn ls_lists_regular_files() {
+fn lists_regular_files() {
     Playground::setup("ls_test_1", |dirs, sandbox| {
         sandbox.with_files(vec![
             EmptyFile("yehuda.txt"),
@@ -13,7 +12,7 @@ fn ls_lists_regular_files() {
         ]);
 
         let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
+            cwd: dirs.test(), pipeline(
             r#"
                 ls
                 | count
@@ -26,7 +25,7 @@ fn ls_lists_regular_files() {
 }
 
 #[test]
-fn ls_lists_regular_files_using_asterisk_wildcard() {
+fn lists_regular_files_using_asterisk_wildcard() {
     Playground::setup("ls_test_2", |dirs, sandbox| {
         sandbox.with_files(vec![
             EmptyFile("los.txt"),
@@ -36,7 +35,7 @@ fn ls_lists_regular_files_using_asterisk_wildcard() {
         ]);
 
         let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
+            cwd: dirs.test(), pipeline(
             r#"
                 ls *.txt
                 | count
@@ -49,7 +48,7 @@ fn ls_lists_regular_files_using_asterisk_wildcard() {
 }
 
 #[test]
-fn ls_lists_regular_files_using_question_mark_wildcard() {
+fn lists_regular_files_using_question_mark_wildcard() {
     Playground::setup("ls_test_3", |dirs, sandbox| {
         sandbox.with_files(vec![
             EmptyFile("yehuda.10.txt"),
@@ -59,7 +58,7 @@ fn ls_lists_regular_files_using_question_mark_wildcard() {
         ]);
 
         let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
+            cwd: dirs.test(), pipeline(
             r#"
                 ls *.??.txt
                 | count

tests/commands/mkdir.rs

@@ -1,9 +1,7 @@
-mod helpers;
-
-use helpers as h;
-use helpers::Playground;
-
 use std::path::Path;
+use test_support::fs::files_exist_at;
+use test_support::nu;
+use test_support::playground::Playground;
 
 #[test]
 fn creates_directory() {
@@ -27,7 +25,7 @@ fn accepts_and_creates_directories() {
             "mkdir dir_1 dir_2 dir_3"
         );
 
-        assert!(h::files_exist_at(
+        assert!(files_exist_at(
             vec![Path::new("dir_1"), Path::new("dir_2"), Path::new("dir_3")],
             dirs.test()
         ));

tests/commands/mod.rs

@@ -0,0 +1,30 @@
+mod append;
+mod cd;
+mod compact;
+mod cp;
+mod default;
+mod edit;
+mod enter;
+mod first;
+mod format;
+mod get;
+mod group_by;
+mod histogram;
+mod insert;
+mod last;
+mod lines;
+mod ls;
+mod mkdir;
+mod mv;
+mod open;
+mod parse;
+mod prepend;
+mod range;
+mod reverse;
+mod rm;
+mod save;
+mod sort_by;
+mod split_by;
+mod split_column;
+mod where_;
+mod wrap;

tests/commands/mv.rs

@@ -1,7 +1,6 @@
-mod helpers;
-
-use helpers as h;
-use helpers::{Playground, Stub::*};
+use test_support::fs::{files_exist_at, Stub::EmptyFile};
+use test_support::nu;
+use test_support::playground::Playground;
 
 #[test]
 fn moves_a_file() {
@@ -148,7 +147,7 @@ fn moves_using_path_with_wildcard() {
 
         nu!(cwd: work_dir, "mv ../originals/*.ini ../expected");
 
-        assert!(h::files_exist_at(
+        assert!(files_exist_at(
             vec!["yehuda.ini", "jonathan.ini", "sample.ini", "andres.ini",],
             expected
         ));
@@ -175,7 +174,7 @@ fn moves_using_a_glob() {
         nu!(cwd: work_dir, "mv ../meals/* ../expected");
 
         assert!(meal_dir.exists());
-        assert!(h::files_exist_at(
+        assert!(files_exist_at(
             vec!["arepa.txt", "empanada.txt", "taquiza.txt",],
             expected
         ));

tests/commands/nth.rs

@@ -0,0 +1,39 @@
+#[test]
+fn selects_a_row() {
+    Playground::setup("nth_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![EmptyFile("notes.txt"), EmptyFile("arepas.txt")]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                ls
+                | sort-by name
+                | nth 0
+                | get name
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "arepas.txt");
+    });
+}
+
+#[test]
+fn selects_many_rows() {
+    Playground::setup("nth_test_2", |dirs, sandbox| {
+        sandbox.with_files(vec![EmptyFile("notes.txt"), EmptyFile("arepas.txt")]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                ls
+                | get name
+                | nth 1 0
+                | count
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "2");
+    });
+}

tests/commands/open.rs

@@ -1,10 +1,9 @@
-mod helpers;
-
-use helpers as h;
-use helpers::{Playground, Stub::*};
+use test_support::fs::Stub::FileWithContentToBeTrimmed;
+use test_support::playground::Playground;
+use test_support::{nu, nu_error, pipeline};
 
 #[test]
-fn recognizes_csv() {
+fn parses_csv() {
     Playground::setup("open_test_1", |dirs, sandbox| {
         sandbox.with_files(vec![FileWithContentToBeTrimmed(
             "nu.zion.csv",
@@ -17,7 +16,7 @@ fn recognizes_csv() {
         )]);
 
         let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
+            cwd: dirs.test(), pipeline(
             r#"
                 open nu.zion.csv
                 | where author == "Andres N. Robalino"
@@ -56,7 +55,7 @@ fn recognizes_csv() {
 //
 
 #[test]
-fn open_can_parse_bson_1() {
+fn parses_bson() {
     let actual = nu!(
         cwd: "tests/fixtures/formats",
         "open sample.bson | get root | nth 0 | get b | echo $it"
@@ -66,9 +65,9 @@ fn open_can_parse_bson_1() {
 }
 
 #[test]
-fn open_can_parse_bson_2() {
+fn parses_more_bson_complexity() {
     let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
+        cwd: "tests/fixtures/formats", pipeline(
         r#"
             open sample.bson
             | get root
@@ -132,9 +131,9 @@ fn open_can_parse_bson_2() {
 // ━━━┷━━━━━━
 
 #[test]
-fn open_can_parse_sqlite() {
+fn parses_sqlite() {
     let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
+        cwd: "tests/fixtures/formats", pipeline(
         r#"
             open sample.db
             | get table_values
@@ -147,7 +146,7 @@ fn open_can_parse_sqlite() {
 }
 
 #[test]
-fn open_can_parse_toml() {
+fn parses_toml() {
     let actual = nu!(
         cwd: "tests/fixtures/formats",
         "open cargo_sample.toml | get package.edition | echo $it"
@@ -157,9 +156,9 @@ fn open_can_parse_toml() {
 }
 
 #[test]
-fn open_can_parse_tsv() {
+fn parses_tsv() {
     let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
+        cwd: "tests/fixtures/formats", pipeline(
         r#"
             open caco3_plastics.tsv
             | first 1
@@ -172,9 +171,9 @@ fn open_can_parse_tsv() {
 }
 
 #[test]
-fn open_can_parse_json() {
+fn parses_json() {
     let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
+        cwd: "tests/fixtures/formats", pipeline(
         r#"
             open sgml_description.json
             | get glossary.GlossDiv.GlossList.GlossEntry.GlossSee
@@ -186,7 +185,7 @@ fn open_can_parse_json() {
 }
 
 #[test]
-fn open_can_parse_xml() {
+fn parses_xml() {
     let actual = nu!(
         cwd: "tests/fixtures/formats",
         "open jonathan.xml | get rss.channel | get item | get link | echo $it"
@@ -199,7 +198,7 @@ fn open_can_parse_xml() {
 }
 
 #[test]
-fn open_can_parse_ini() {
+fn parses_ini() {
     let actual = nu!(
         cwd: "tests/fixtures/formats",
         "open sample.ini | get SectionOne.integer | echo $it"
@@ -209,7 +208,7 @@ fn open_can_parse_ini() {
 }
 
 #[test]
-fn open_can_parse_utf16_ini() {
+fn parses_utf16_ini() {
     let actual = nu!(
         cwd: "tests/fixtures/formats",
         "open utf16.ini | get '.ShellClassInfo' | get IconIndex | echo $it"

tests/commands/parse.rs

@@ -0,0 +1,17 @@
+use test_support::{nu, pipeline};
+
+#[test]
+fn extracts_fields_from_the_given_the_pattern() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open fileA.txt
+            | parse "{Name}={Value}"
+            | nth 1
+            | get Value
+            | echo $it
+        "#
+    ));
+
+    assert_eq!(actual, "StupidLongName");
+}

tests/commands/prepend.rs

@@ -0,0 +1,17 @@
+use test_support::{nu, pipeline};
+
+#[test]
+fn adds_a_row_to_the_beginning() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open fileA.txt
+            | lines
+            | prepend "testme"
+            | nth 0
+            | echo $it
+        "#
+    ));
+
+    assert_eq!(actual, "testme");
+}

tests/commands/range.rs

@@ -0,0 +1,47 @@
+use test_support::fs::Stub::EmptyFile;
+use test_support::playground::Playground;
+use test_support::{nu, pipeline};
+
+#[test]
+fn selects_a_row() {
+    Playground::setup("range_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![EmptyFile("notes.txt"), EmptyFile("tests.txt")]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                ls
+                | sort-by name
+                | range 0..0
+                | get name
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "notes.txt");
+    });
+}
+
+#[test]
+fn selects_some_rows() {
+    Playground::setup("range_test_2", |dirs, sandbox| {
+        sandbox.with_files(vec![
+            EmptyFile("notes.txt"),
+            EmptyFile("tests.txt"),
+            EmptyFile("persons.txt"),
+        ]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                ls
+                | get name
+                | range 1..2
+                | count
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "2");
+    });
+}

tests/commands/reverse.rs

@@ -0,0 +1,11 @@
+use test_support::nu;
+
+#[test]
+fn can_get_reverse_first() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats",
+        "ls | sort-by name | reverse | first 1 | get name | trim | echo $it"
+    );
+
+    assert_eq!(actual, "utf16.ini");
+}

tests/commands/rm.rs

@@ -1,10 +1,9 @@
-mod helpers;
-
-use helpers as h;
-use helpers::{Playground, Stub::*};
+use test_support::fs::{files_exist_at, Stub::EmptyFile};
+use test_support::playground::Playground;
+use test_support::{nu, nu_error};
 
 #[test]
-fn rm_removes_a_file() {
+fn removes_a_file() {
     Playground::setup("rm_test_1", |dirs, sandbox| {
         sandbox.with_files(vec![EmptyFile("i_will_be_deleted.txt")]);
 
@@ -20,7 +19,7 @@ fn rm_removes_a_file() {
 }
 
 #[test]
-fn rm_removes_files_with_wildcard() {
+fn removes_files_with_wildcard() {
     Playground::setup("rm_test_2", |dirs, sandbox| {
         sandbox
             .within("src")
@@ -44,7 +43,7 @@ fn rm_removes_files_with_wildcard() {
             r#"rm "src/*/*/*.rs""#
         );
 
-        assert!(!h::files_exist_at(
+        assert!(!files_exist_at(
             vec![
                 "src/parser/parse/token_tree.rs",
                 "src/parser/hir/baseline_parse.rs",
@@ -61,7 +60,7 @@ fn rm_removes_files_with_wildcard() {
 }
 
 #[test]
-fn rm_removes_deeply_nested_directories_with_wildcard_and_recursive_flag() {
+fn removes_deeply_nested_directories_with_wildcard_and_recursive_flag() {
     Playground::setup("rm_test_3", |dirs, sandbox| {
         sandbox
             .within("src")
@@ -85,7 +84,7 @@ fn rm_removes_deeply_nested_directories_with_wildcard_and_recursive_flag() {
             "rm src/* --recursive"
         );
 
-        assert!(!h::files_exist_at(
+        assert!(!files_exist_at(
             vec!["src/parser/parse", "src/parser/hir"],
             dirs.test()
         ));
@@ -93,7 +92,7 @@ fn rm_removes_deeply_nested_directories_with_wildcard_and_recursive_flag() {
 }
 
 #[test]
-fn rm_removes_directory_contents_without_recursive_flag_if_empty() {
+fn removes_directory_contents_without_recursive_flag_if_empty() {
     Playground::setup("rm_test_4", |dirs, _| {
         nu!(
             cwd: dirs.root(),
@@ -105,7 +104,7 @@ fn rm_removes_directory_contents_without_recursive_flag_if_empty() {
 }
 
 #[test]
-fn rm_removes_directory_contents_with_recursive_flag() {
+fn removes_directory_contents_with_recursive_flag() {
     Playground::setup("rm_test_5", |dirs, sandbox| {
         sandbox.with_files(vec![
             EmptyFile("yehuda.txt"),
@@ -123,7 +122,7 @@ fn rm_removes_directory_contents_with_recursive_flag() {
 }
 
 #[test]
-fn rm_errors_if_attempting_to_delete_a_directory_with_content_without_recursive_flag() {
+fn errors_if_attempting_to_delete_a_directory_with_content_without_recursive_flag() {
     Playground::setup("rm_test_6", |dirs, sandbox| {
         sandbox.with_files(vec![EmptyFile("some_empty_file.txt")]);
 
@@ -138,7 +137,7 @@ fn rm_errors_if_attempting_to_delete_a_directory_with_content_without_recursive_
 }
 
 #[test]
-fn rm_errors_if_attempting_to_delete_single_dot_as_argument() {
+fn errors_if_attempting_to_delete_single_dot_as_argument() {
     Playground::setup("rm_test_7", |dirs, _| {
         let actual = nu_error!(
             cwd: dirs.root(),
@@ -150,7 +149,7 @@ fn rm_errors_if_attempting_to_delete_single_dot_as_argument() {
 }
 
 #[test]
-fn rm_errors_if_attempting_to_delete_two_dot_as_argument() {
+fn errors_if_attempting_to_delete_two_dot_as_argument() {
     Playground::setup("rm_test_8", |dirs, _| {
         let actual = nu_error!(
             cwd: dirs.root(),

tests/commands/save.rs

@@ -0,0 +1,47 @@
+use test_support::fs::{file_contents, Stub::FileWithContent};
+use test_support::nu;
+use test_support::playground::Playground;
+
+#[test]
+fn figures_out_intelligently_where_to_write_out_with_metadata() {
+    Playground::setup("save_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContent(
+            "cargo_sample.toml",
+            r#"
+                [package]
+                name = "nu"
+                version = "0.1.1"
+                authors = ["Yehuda Katz <wycats@gmail.com>"]
+                description = "A shell for the GitHub era"
+                license = "ISC"
+                edition = "2018"
+            "#,
+        )]);
+
+        let subject_file = dirs.test().join("cargo_sample.toml");
+
+        nu!(
+            cwd: dirs.root(),
+            "open save_test_1/cargo_sample.toml | save"
+        );
+
+        let actual = file_contents(&subject_file);
+        assert!(actual.contains("0.1.1"));
+    })
+}
+
+#[test]
+fn writes_out_csv() {
+    Playground::setup("save_test_2", |dirs, _| {
+        let expected_file = dirs.test().join("cargo_sample.csv");
+
+        nu!(
+            cwd: dirs.root(),
+            "open {}/cargo_sample.toml | get package | save save_test_2/cargo_sample.csv",
+            dirs.formats()
+        );
+
+        let actual = file_contents(expected_file);
+        assert!(actual.contains("[Table],A shell for the GitHub era,2018,ISC,nu,0.1.1"));
+    })
+}

tests/commands/sort_by.rs

@@ -0,0 +1,23 @@
+use test_support::{nu, pipeline};
+
+#[test]
+fn by_column() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open cargo_sample.toml --raw
+            | lines
+            | skip 1
+            | first 4
+            | split-column "="
+            | sort-by Column1
+            | skip 1
+            | first 1
+            | get Column1
+            | trim
+            | echo $it
+        "#
+    ));
+
+    assert_eq!(actual, "description");
+}

tests/commands/split_by.rs

@@ -0,0 +1,55 @@
+use test_support::fs::Stub::{EmptyFile, FileWithContentToBeTrimmed};
+use test_support::playground::Playground;
+use test_support::{nu, nu_error, pipeline};
+
+#[test]
+fn splits() {
+    Playground::setup("split_by_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "los_tres_caballeros.csv",
+            r#"
+                first_name,last_name,rusty_at,type
+                Andrés,Robalino,10/11/2013,A
+                Jonathan,Turner,10/12/2013,B
+                Yehuda,Katz,10/11/2013,A
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open los_tres_caballeros.csv
+                | group-by rusty_at
+                | split-by type
+                | get A."10/11/2013"
+                | count
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "2");
+    })
+}
+
+#[test]
+fn errors_if_no_table_given_as_input() {
+    Playground::setup("split_by_test_2", |dirs, sandbox| {
+        sandbox.with_files(vec![
+            EmptyFile("los.txt"),
+            EmptyFile("tres.txt"),
+            EmptyFile("amigos.txt"),
+            EmptyFile("arepas.clu"),
+        ]);
+
+        let actual = nu_error!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                ls
+                | get name
+                | split-by type
+            "#
+        ));
+
+        assert!(actual.contains("Expected table from pipeline"));
+    })
+}

tests/commands/split_column.rs

@@ -0,0 +1,20 @@
+use test_support::{nu, pipeline};
+
+#[test]
+fn by_column() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open cargo_sample.toml --raw
+            | lines
+            | skip 1
+            | first 1
+            | split-column "="
+            | get Column1
+            | trim
+            | echo $it
+        "#
+    ));
+
+    assert_eq!(actual, "name");
+}

tests/commands/where_.rs

@@ -1,11 +1,19 @@
-mod helpers;
-
-use helpers as h;
+use test_support::{nu, pipeline};
 
 #[test]
-fn test_compare() {
+fn filters_by_unit_size_comparison() {
     let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
+        cwd: "tests/fixtures/formats",
+        "ls | where size > 1kb | sort-by size | get name | first 1 | trim | echo $it"
+    );
+
+    assert_eq!(actual, "cargo_sample.toml");
+}
+
+#[test]
+fn binary_operator_comparisons() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
         r#"
             open sample.db
             | where table_name == ints
@@ -20,7 +28,7 @@ fn test_compare() {
     assert_eq!(actual, "4253");
 
     let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
+        cwd: "tests/fixtures/formats", pipeline(
         r#"
             open sample.db
             | where table_name == ints
@@ -35,7 +43,7 @@ fn test_compare() {
     assert_eq!(actual, "4253");
 
     let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
+        cwd: "tests/fixtures/formats", pipeline(
         r#"
             open sample.db
             | where table_name == ints
@@ -50,7 +58,7 @@ fn test_compare() {
     assert_eq!(actual, "1");
 
     let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
+        cwd: "tests/fixtures/formats", pipeline(
         r#"
             open sample.db
             | where table_name == ints
@@ -65,7 +73,7 @@ fn test_compare() {
     assert_eq!(actual, "1");
 
     let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
+        cwd: "tests/fixtures/formats", pipeline(
         r#"
             open sample.db
             | where table_name == ints
@@ -81,9 +89,9 @@ fn test_compare() {
 }
 
 #[test]
-fn test_contains() {
+fn contains_operator() {
     let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
+        cwd: "tests/fixtures/formats", pipeline(
         r#"
             open sample.db
             | where table_name == strings
@@ -97,7 +105,7 @@ fn test_contains() {
     assert_eq!(actual, "4");
 
     let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
+        cwd: "tests/fixtures/formats", pipeline(
         r#"
             open sample.db
             | where table_name == strings

tests/commands/wrap.rs

@@ -0,0 +1,63 @@
+use test_support::fs::Stub::FileWithContentToBeTrimmed;
+use test_support::playground::Playground;
+use test_support::{nu, pipeline};
+
+#[test]
+fn wrap_rows_into_a_row() {
+    Playground::setup("embed_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "los_tres_caballeros.txt",
+            r#"
+                first_name,last_name
+                Andrés,Robalino
+                Jonathan,Turner
+                Yehuda,Katz
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open los_tres_caballeros.txt
+                | from-csv
+                | wrap caballeros
+                | get caballeros
+                | nth 0
+                | get last_name
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "Robalino");
+    })
+}
+
+#[test]
+fn wrap_rows_into_a_table() {
+    Playground::setup("embed_test_2", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "los_tres_caballeros.txt",
+            r#"
+                first_name,last_name
+                Andrés,Robalino
+                Jonathan,Turner
+                Yehuda,Katz
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open los_tres_caballeros.txt
+                | from-csv
+                | get last_name
+                | wrap caballero
+                | nth 2
+                | get caballero
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "Katz");
+    })
+}

tests/commands_test.rs

@@ -1,564 +0,0 @@
-mod helpers;
-
-use helpers as h;
-use helpers::{Playground, Stub::*};
-
-#[test]
-fn nth_selects_a_row() {
-    Playground::setup("nth_test_1", |dirs, sandbox| {
-        sandbox.with_files(vec![EmptyFile("notes.txt"), EmptyFile("arepas.txt")]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                ls
-                | sort-by name
-                | nth 0
-                | get name
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "arepas.txt");
-    });
-}
-
-#[test]
-fn nth_selects_many_rows() {
-    Playground::setup("nth_test_2", |dirs, sandbox| {
-        sandbox.with_files(vec![EmptyFile("notes.txt"), EmptyFile("arepas.txt")]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                ls
-                | get name
-                | nth 1 0
-                | count
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "2");
-    });
-}
-#[test]
-fn default_row_data_if_column_missing() {
-    Playground::setup("default_test_1", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "los_tres_amigos.json",
-            r#"
-                {
-                    "amigos": [
-                        {"name":   "Yehuda"},
-                        {"name": "Jonathan", "rusty_luck": 0},
-                        {"name":   "Andres", "rusty_luck": 0},
-                        {"name":"GorbyPuff"}
-                    ]
-                }
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open los_tres_amigos.json
-                | get amigos
-                | default rusty_luck 1
-                | where rusty_luck == 1
-                | count
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "2");
-    });
-}
-#[test]
-fn compact_rows_where_given_column_is_empty() {
-    Playground::setup("compact_test_1", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "los_tres_amigos.json",
-            r#"
-                {
-                    "amigos": [
-                        {"name":   "Yehuda", "rusty_luck": 1},
-                        {"name": "Jonathan", "rusty_luck": 1},
-                        {"name":   "Andres", "rusty_luck": 1},
-                        {"name":"GorbyPuff"}
-                    ]
-                }
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open los_tres_amigos.json
-                | get amigos
-                | compact rusty_luck
-                | count
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "3");
-    });
-}
-#[test]
-fn compact_empty_rows_by_default() {
-    Playground::setup("compact_test_2", |dirs, _| {
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                echo "[1,2,3,14,null]"
-                | from-json
-                | compact
-                | count
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "4");
-    });
-}
-#[test]
-fn group_by() {
-    Playground::setup("group_by_test_1", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "los_tres_caballeros.csv",
-            r#"
-                first_name,last_name,rusty_at,type
-                Andrés,Robalino,10/11/2013,A
-                Jonathan,Turner,10/12/2013,B
-                Yehuda,Katz,10/11/2013,A
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open los_tres_caballeros.csv
-                | group-by rusty_at
-                | get "10/11/2013"
-                | count
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "2");
-    })
-}
-
-#[test]
-fn histogram() {
-    Playground::setup("histogram_test_1", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "los_tres_caballeros.csv",
-            r#"
-                first_name,last_name,rusty_at
-                Andrés,Robalino,Ecuador
-                Jonathan,Turner,Estados Unidos
-                Yehuda,Katz,Estados Unidos
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open los_tres_caballeros.csv
-                | histogram rusty_at countries
-                | where rusty_at == "Ecuador"
-                | get countries
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "**************************************************");
-        // 50%
-    })
-}
-
-#[test]
-fn group_by_errors_if_unknown_column_name() {
-    Playground::setup("group_by_test_2", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "los_tres_caballeros.csv",
-            r#"
-                first_name,last_name,rusty_at,type
-                Andrés,Robalino,10/11/2013,A
-                Jonathan,Turner,10/12/2013,B
-                Yehuda,Katz,10/11/2013,A
-            "#,
-        )]);
-
-        let actual = nu_error!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open los_tres_caballeros.csv
-                | group-by ttype
-            "#
-        ));
-
-        assert!(actual.contains("Unknown column"));
-    })
-}
-
-#[test]
-fn range_selects_a_row() {
-    Playground::setup("range_test_1", |dirs, sandbox| {
-        sandbox.with_files(vec![EmptyFile("notes.txt"), EmptyFile("tests.txt")]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                ls
-                | sort-by name
-                | range 0..0
-                | get name
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "notes.txt");
-    });
-}
-
-#[test]
-fn range_selects_some_rows() {
-    Playground::setup("range_test_2", |dirs, sandbox| {
-        sandbox.with_files(vec![
-            EmptyFile("notes.txt"),
-            EmptyFile("tests.txt"),
-            EmptyFile("persons.txt"),
-        ]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                ls
-                | get name
-                | range 1..2
-                | count
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "2");
-    });
-}
-
-#[test]
-fn split_by() {
-    Playground::setup("split_by_test_1", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "los_tres_caballeros.csv",
-            r#"
-                first_name,last_name,rusty_at,type
-                Andrés,Robalino,10/11/2013,A
-                Jonathan,Turner,10/12/2013,B
-                Yehuda,Katz,10/11/2013,A
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open los_tres_caballeros.csv
-                | group-by rusty_at
-                | split-by type
-                | get A."10/11/2013"
-                | count
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "2");
-    })
-}
-
-#[test]
-fn split_by_errors_if_no_table_given_as_input() {
-    Playground::setup("split_by_test_2", |dirs, sandbox| {
-        sandbox.with_files(vec![
-            EmptyFile("los.txt"),
-            EmptyFile("tres.txt"),
-            EmptyFile("amigos.txt"),
-            EmptyFile("arepas.clu"),
-        ]);
-
-        let actual = nu_error!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                ls
-                | get name
-                | split-by type
-            "#
-        ));
-
-        assert!(actual.contains("Expected table from pipeline"));
-    })
-}
-
-#[test]
-fn first_gets_first_rows_by_amount() {
-    Playground::setup("first_test_1", |dirs, sandbox| {
-        sandbox.with_files(vec![
-            EmptyFile("los.txt"),
-            EmptyFile("tres.txt"),
-            EmptyFile("amigos.txt"),
-            EmptyFile("arepas.clu"),
-        ]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                ls
-                | first 3
-                | count
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "3");
-    })
-}
-
-#[test]
-fn first_gets_all_rows_if_amount_higher_than_all_rows() {
-    Playground::setup("first_test_2", |dirs, sandbox| {
-        sandbox.with_files(vec![
-            EmptyFile("los.txt"),
-            EmptyFile("tres.txt"),
-            EmptyFile("amigos.txt"),
-            EmptyFile("arepas.clu"),
-        ]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                ls
-                | first 99
-                | count
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "4");
-    })
-}
-
-#[test]
-fn first_gets_first_row_when_no_amount_given() {
-    Playground::setup("first_test_3", |dirs, sandbox| {
-        sandbox.with_files(vec![EmptyFile("caballeros.txt"), EmptyFile("arepas.clu")]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                ls
-                | first
-                | count
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "1");
-    })
-}
-
-#[test]
-fn last_gets_last_rows_by_amount() {
-    Playground::setup("last_test_1", |dirs, sandbox| {
-        sandbox.with_files(vec![
-            EmptyFile("los.txt"),
-            EmptyFile("tres.txt"),
-            EmptyFile("amigos.txt"),
-            EmptyFile("arepas.clu"),
-        ]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                ls
-                | last 3
-                | count
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "3");
-    })
-}
-
-#[test]
-fn last_gets_last_row_when_no_amount_given() {
-    Playground::setup("last_test_2", |dirs, sandbox| {
-        sandbox.with_files(vec![EmptyFile("caballeros.txt"), EmptyFile("arepas.clu")]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                ls
-                | last
-                | count
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "1");
-    })
-}
-
-#[test]
-fn get() {
-    Playground::setup("get_test_1", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContent(
-            "sample.toml",
-            r#"
-                nu_party_venue = "zion"
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open sample.toml
-                | get nu_party_venue
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "zion");
-    })
-}
-
-#[test]
-fn get_more_than_one_member() {
-    Playground::setup("get_test_2", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContent(
-            "sample.toml",
-            r#"
-                [[fortune_tellers]]
-                name = "Andrés N. Robalino"
-                arepas = 1
-                broken_builds = 0
-
-                [[fortune_tellers]]
-                name = "Jonathan Turner"
-                arepas = 1
-                broken_builds = 1
-
-                [[fortune_tellers]]
-                name = "Yehuda Katz"
-                arepas = 1
-                broken_builds = 1
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open sample.toml
-                | get fortune_tellers
-                | get arepas broken_builds
-                | where $it == 1
-                | count
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "5");
-    })
-}
-
-#[test]
-fn lines() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
-        r#"
-            open cargo_sample.toml --raw
-            | lines
-            | skip-while $it != "[dependencies]"
-            | skip 1
-            | first 1
-            | split-column "="
-            | get Column1
-            | trim
-            | echo $it
-        "#
-    ));
-
-    assert_eq!(actual, "rustyline");
-}
-
-#[test]
-fn save_figures_out_intelligently_where_to_write_out_with_metadata() {
-    Playground::setup("save_test_1", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContent(
-            "cargo_sample.toml",
-            r#"
-                [package]
-                name = "nu"
-                version = "0.1.1"
-                authors = ["Yehuda Katz <wycats@gmail.com>"]
-                description = "A shell for the GitHub era"
-                license = "ISC"
-                edition = "2018"
-            "#,
-        )]);
-
-        let subject_file = dirs.test().join("cargo_sample.toml");
-
-        nu!(
-            cwd: dirs.root(),
-            "open save_test_1/cargo_sample.toml | save"
-        );
-
-        let actual = h::file_contents(&subject_file);
-        assert!(actual.contains("0.1.1"));
-    })
-}
-
-#[test]
-fn it_arg_works_with_many_inputs_to_external_command() {
-    Playground::setup("it_arg_works_with_many_inputs", |dirs, sandbox| {
-        sandbox.with_files(vec![
-            FileWithContent("file1", "text"),
-            FileWithContent("file2", " and more text"),
-        ]);
-
-        let (stdout, stderr) = nu_combined!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                echo hello world
-                | split-row " "
-                | ^echo $it
-            "#
-        ));
-
-        #[cfg(windows)]
-        assert_eq!("hello world", stdout);
-
-        #[cfg(not(windows))]
-        assert_eq!("helloworld", stdout);
-
-        assert!(!stderr.contains("No such file or directory"));
-    })
-}
-
-#[test]
-fn save_can_write_out_csv() {
-    Playground::setup("save_test_2", |dirs, _| {
-        let expected_file = dirs.test().join("cargo_sample.csv");
-
-        nu!(
-            cwd: dirs.root(),
-            "open {}/cargo_sample.toml | get package | save save_test_2/cargo_sample.csv",
-            dirs.formats()
-        );
-
-        let actual = h::file_contents(expected_file);
-        assert!(actual.contains("[Table],A shell for the GitHub era,2018,ISC,nu,0.1.1"));
-    })
-}

tests/converting_formats/bson.rs

@@ -0,0 +1,18 @@
+use test_support::{nu, pipeline};
+
+#[test]
+fn table_to_bson_and_back_into_table() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open sample.bson
+            | to-bson
+            | from-bson
+            | get root
+            | get 1.b
+            | echo $it
+        "#
+    ));
+
+    assert_eq!(actual, "whel");
+}

tests/converting_formats/csv.rs

@@ -0,0 +1,184 @@
+use test_support::fs::Stub::FileWithContentToBeTrimmed;
+use test_support::playground::Playground;
+use test_support::{nu, pipeline};
+
+#[test]
+fn table_to_csv_text_and_from_csv_text_back_into_table() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats",
+        "open caco3_plastics.csv | to-csv | from-csv | first 1 | get origin | echo $it"
+    );
+
+    assert_eq!(actual, "SPAIN");
+}
+
+#[test]
+fn table_to_csv_text() {
+    Playground::setup("filter_to_csv_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "csv_text_sample.txt",
+            r#"
+                importer,shipper,tariff_item,name,origin
+                Plasticos Rival,Reverte,2509000000,Calcium carbonate,Spain
+                Tigre Ecuador,OMYA Andina,3824909999,Calcium carbonate,Colombia
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open csv_text_sample.txt
+                | lines
+                | trim
+                | split-column "," a b c d origin
+                | last 1
+                | to-csv
+                | lines
+                | nth 1
+                | echo $it
+            "#
+        ));
+
+        assert!(actual.contains("Tigre Ecuador,OMYA Andina,3824909999,Calcium carbonate,Colombia"));
+    })
+}
+
+#[test]
+fn table_to_csv_text_skipping_headers_after_conversion() {
+    Playground::setup("filter_to_csv_test_2", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "csv_text_sample.txt",
+            r#"
+                importer,shipper,tariff_item,name,origin
+                Plasticos Rival,Reverte,2509000000,Calcium carbonate,Spain
+                Tigre Ecuador,OMYA Andina,3824909999,Calcium carbonate,Colombia
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open csv_text_sample.txt
+                | lines
+                | trim
+                | split-column "," a b c d origin
+                | last 1
+                | to-csv --headerless
+                | echo $it
+            "#
+        ));
+
+        assert!(actual.contains("Tigre Ecuador,OMYA Andina,3824909999,Calcium carbonate,Colombia"));
+    })
+}
+
+#[test]
+fn from_csv_text_to_table() {
+    Playground::setup("filter_from_csv_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "los_tres_caballeros.txt",
+            r#"
+                first_name,last_name,rusty_luck
+                Andrés,Robalino,1
+                Jonathan,Turner,1
+                Yehuda,Katz,1
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open los_tres_caballeros.txt
+                | from-csv
+                | get rusty_luck
+                | count
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "3");
+    })
+}
+
+#[test]
+fn from_csv_text_with_separator_to_table() {
+    Playground::setup("filter_from_csv_test_2", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "los_tres_caballeros.txt",
+            r#"
+                first_name;last_name;rusty_luck
+                Andrés;Robalino;1
+                Jonathan;Turner;1
+                Yehuda;Katz;1
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open los_tres_caballeros.txt
+                | from-csv --separator ';'
+                | get rusty_luck
+                | count
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "3");
+    })
+}
+
+#[test]
+fn from_csv_text_with_tab_separator_to_table() {
+    Playground::setup("filter_from_csv_test_3", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "los_tres_caballeros.txt",
+            r#"
+                first_name	last_name	rusty_luck
+                Andrés	Robalino	1
+                Jonathan	Turner	1
+                Yehuda	Katz	1
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open los_tres_caballeros.txt
+                | from-csv --separator '\t'
+                | get rusty_luck
+                | count
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "3");
+    })
+}
+
+#[test]
+fn from_csv_text_skipping_headers_to_table() {
+    Playground::setup("filter_from_csv_test_4", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "los_tres_amigos.txt",
+            r#"
+                Andrés,Robalino,1
+                Jonathan,Turner,1
+                Yehuda,Katz,1
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open los_tres_amigos.txt
+                | from-csv --headerless
+                | get Column3
+                | count
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "3");
+    })
+}

tests/converting_formats/json.rs

@@ -0,0 +1,103 @@
+use test_support::fs::Stub::FileWithContentToBeTrimmed;
+use test_support::playground::Playground;
+use test_support::{nu, pipeline};
+
+#[test]
+fn table_to_json_text_and_from_json_text_back_into_table() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open sgml_description.json
+            | to-json
+            | from-json
+            | get glossary.GlossDiv.GlossList.GlossEntry.GlossSee
+            | echo $it
+        "#
+    ));
+
+    assert_eq!(actual, "markup");
+}
+
+#[test]
+fn from_json_text_to_table() {
+    Playground::setup("filter_from_json_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "katz.txt",
+            r#"
+                {
+                    "katz": [
+                        {"name":   "Yehuda", "rusty_luck": 1},
+                        {"name": "Jonathan", "rusty_luck": 1},
+                        {"name":   "Andres", "rusty_luck": 1},
+                        {"name":"GorbyPuff", "rusty_luck": 1}
+                    ]
+                }
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(),
+            "open katz.txt | from-json | get katz | get rusty_luck | count | echo $it"
+        );
+
+        assert_eq!(actual, "4");
+    })
+}
+
+#[test]
+fn from_json_text_recognizing_objects_independently_to_table() {
+    Playground::setup("filter_from_json_test_2", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "katz.txt",
+            r#"
+                {"name":   "Yehuda", "rusty_luck": 1}
+                {"name": "Jonathan", "rusty_luck": 1}
+                {"name":   "Andres", "rusty_luck": 1}
+                {"name":"GorbyPuff", "rusty_luck": 3}
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open katz.txt
+                | from-json --objects
+                | where name == "GorbyPuff"
+                | get rusty_luck
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "3");
+    })
+}
+
+#[test]
+fn table_to_json_text() {
+    Playground::setup("filter_to_json_test", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "sample.txt",
+            r#"
+                JonAndrehudaTZ,3
+                GorbyPuff,100
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open sample.txt
+                | lines
+                | split-column "," name luck
+                | pick name
+                | to-json
+                | from-json
+                | nth 0
+                | get name
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "JonAndrehudaTZ");
+    })
+}

tests/converting_formats/mod.rs

@@ -0,0 +1,10 @@
+mod bson;
+mod csv;
+mod json;
+mod sqlite;
+mod ssv;
+mod toml;
+mod tsv;
+mod url;
+mod xlsx;
+mod yaml;

tests/converting_formats/sqlite.rs

@@ -0,0 +1,19 @@
+use test_support::{nu, pipeline};
+
+#[test]
+fn table_to_sqlite_and_back_into_table() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open sample.db
+            | to-sqlite
+            | from-sqlite
+            | get table_values
+            | nth 2
+            | get x
+            | echo $it
+        "#
+    ));
+
+    assert_eq!(actual, "hello");
+}

tests/converting_formats/ssv.rs

@@ -0,0 +1,98 @@
+use test_support::fs::Stub::FileWithContentToBeTrimmed;
+use test_support::playground::Playground;
+use test_support::{nu, pipeline};
+
+#[test]
+fn from_ssv_text_to_table() {
+    Playground::setup("filter_from_ssv_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "oc_get_svc.txt",
+            r#"
+                NAME              LABELS                                    SELECTOR                  IP              PORT(S)
+                docker-registry   docker-registry=default                   docker-registry=default   172.30.78.158   5000/TCP
+                kubernetes        component=apiserver,provider=kubernetes   <none>                    172.30.0.2      443/TCP
+                kubernetes-ro     component=apiserver,provider=kubernetes   <none>                    172.30.0.1      80/TCP
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open oc_get_svc.txt
+                | from-ssv
+                | nth 0
+                | get IP
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "172.30.78.158");
+    })
+}
+
+#[test]
+fn from_ssv_text_to_table_with_separator_specified() {
+    Playground::setup("filter_from_ssv_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "oc_get_svc.txt",
+            r#"
+                NAME              LABELS                                    SELECTOR                  IP              PORT(S)
+                docker-registry   docker-registry=default                   docker-registry=default   172.30.78.158   5000/TCP
+                kubernetes        component=apiserver,provider=kubernetes   <none>                    172.30.0.2      443/TCP
+                kubernetes-ro     component=apiserver,provider=kubernetes   <none>                    172.30.0.1      80/TCP
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open oc_get_svc.txt
+                | from-ssv --minimum-spaces 3
+                | nth 0
+                | get IP
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "172.30.78.158");
+    })
+}
+
+#[test]
+fn from_ssv_text_treating_first_line_as_data_with_flag() {
+    Playground::setup("filter_from_ssv_test_2", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "oc_get_svc.txt",
+            r#"
+                docker-registry   docker-registry=default                   docker-registry=default   172.30.78.158   5000/TCP
+                kubernetes        component=apiserver,provider=kubernetes   <none>                    172.30.0.2      443/TCP
+                kubernetes-ro     component=apiserver,provider=kubernetes   <none>                    172.30.0.1      80/TCP
+            "#,
+        )]);
+
+        let aligned_columns = nu!(
+        cwd: dirs.test(), pipeline(
+            r#"
+                open oc_get_svc.txt
+                | from-ssv --headerless --aligned-columns
+                | first
+                | get Column1
+                | echo $it
+            "#
+        ));
+
+        let separator_based = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open oc_get_svc.txt
+                | from-ssv --headerless
+                | first
+                | get Column1
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(aligned_columns, separator_based);
+        assert_eq!(separator_based, "docker-registry");
+    })
+}

tests/converting_formats/toml.rs

@@ -0,0 +1,17 @@
+use test_support::{nu, pipeline};
+
+#[test]
+fn table_to_toml_text_and_from_toml_text_back_into_table() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open cargo_sample.toml
+            | to-toml
+            | from-toml
+            | get package.name
+            | echo $it
+        "#
+    ));
+
+    assert_eq!(actual, "nu");
+}

tests/converting_formats/tsv.rs

@@ -0,0 +1,136 @@
+use test_support::fs::Stub::FileWithContentToBeTrimmed;
+use test_support::playground::Playground;
+use test_support::{nu, pipeline};
+
+#[test]
+fn table_to_tsv_text_and_from_tsv_text_back_into_table() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats",
+        "open caco3_plastics.tsv | to-tsv | from-tsv | first 1 | get origin | echo $it"
+    );
+
+    assert_eq!(actual, "SPAIN");
+}
+
+#[test]
+fn table_to_tsv_text_and_from_tsv_text_back_into_table_using_csv_separator() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats",
+        r"open caco3_plastics.tsv | to-tsv | from-csv --separator '\t' | first 1 | get origin | echo $it"
+    );
+
+    assert_eq!(actual, "SPAIN");
+}
+
+#[test]
+fn table_to_tsv_text() {
+    Playground::setup("filter_to_tsv_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "tsv_text_sample.txt",
+            r#"
+                importer	shipper	tariff_item	name	origin
+                Plasticos Rival	Reverte	2509000000	Calcium carbonate	Spain
+                Tigre Ecuador	OMYA Andina	3824909999	Calcium carbonate	Colombia
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open tsv_text_sample.txt
+                | lines
+                | split-column "\t" a b c d origin
+                | last 1
+                | to-tsv
+                | lines
+                | nth 1
+                | echo $it
+            "#
+        ));
+
+        assert!(actual.contains("Colombia"));
+    })
+}
+
+#[test]
+fn table_to_tsv_text_skipping_headers_after_conversion() {
+    Playground::setup("filter_to_tsv_test_2", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "tsv_text_sample.txt",
+            r#"
+                importer    shipper tariff_item name    origin
+                Plasticos Rival Reverte 2509000000  Calcium carbonate   Spain
+                Tigre Ecuador   OMYA Andina 3824909999  Calcium carbonate   Colombia
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open tsv_text_sample.txt
+                | lines
+                | split-column "\t" a b c d origin
+                | last 1
+                | to-tsv --headerless
+                | echo $it
+            "#
+        ));
+
+        assert!(actual.contains("Colombia"));
+    })
+}
+
+#[test]
+fn from_tsv_text_to_table() {
+    Playground::setup("filter_from_tsv_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "los_tres_amigos.txt",
+            r#"
+                first Name	Last Name	rusty_luck
+                Andrés	Robalino	1
+                Jonathan	Turner	1
+                Yehuda	Katz	1
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open los_tres_amigos.txt
+                | from-tsv
+                | get rusty_luck
+                | count
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "3");
+    })
+}
+
+#[test]
+fn from_tsv_text_skipping_headers_to_table() {
+    Playground::setup("filter_from_tsv_test_2", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "los_tres_amigos.txt",
+            r#"
+                Andrés	Robalino	1
+                Jonathan	Turner	1
+                Yehuda	Katz	1
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open los_tres_amigos.txt
+                | from-tsv --headerless
+                | get Column3
+                | count
+                | echo $it
+            "#
+        ));
+
+        assert_eq!(actual, "3");
+    })
+}

tests/converting_formats/url.rs

@@ -0,0 +1,17 @@
+use test_support::{nu, pipeline};
+
+#[test]
+fn can_encode_and_decode_urlencoding() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+            r#"
+                open sample.url
+                | to-url
+                | from-url
+                | get cheese
+                | echo $it
+            "#
+    ));
+
+    assert_eq!(actual, "comté");
+}

tests/converting_formats/xlsx.rs

@@ -0,0 +1,17 @@
+use test_support::{nu, pipeline};
+
+#[test]
+fn from_excel_file_to_table() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open sample_data.xlsx
+            | get SalesOrders
+            | nth 4
+            | get Column2
+            | echo $it
+        "#
+    ));
+
+    assert_eq!(actual, "Gill");
+}

tests/converting_formats/yaml.rs

@@ -0,0 +1,17 @@
+use test_support::{nu, pipeline};
+
+#[test]
+fn table_to_yaml_text_and_from_yaml_text_back_into_table() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open appveyor.yml
+            | to-yaml
+            | from-yaml
+            | get environment.global.PROJECT_NAME
+            | echo $it
+        "#
+    ));
+
+    assert_eq!(actual, "nushell");
+}

tests/external_tests.rs

@@ -1,42 +0,0 @@
-mod helpers;
-
-use helpers::Playground;
-
-#[test]
-fn external_command() {
-    let actual = nu!(
-        cwd: "tests/fixtures",
-        "echo 1"
-    );
-
-    assert!(actual.contains("1"));
-}
-
-#[test]
-fn spawn_external_process_with_home_in_arguments() {
-    Playground::setup("echo_tilde", |dirs, _| {
-        let actual = nu!(
-            cwd: dirs.test(),
-            r#"
-                sh -c "echo ~"
-            "#
-        );
-
-        assert!(
-            !actual.contains("~"),
-            format!("'{}' should not contain ~", actual)
-        );
-    })
-}
-
-#[test]
-fn spawn_external_process_with_tilde_in_arguments() {
-    let actual = nu!(
-        cwd: "tests/fixtures",
-        r#"
-            sh -c "echo 1~1"
-        "#
-    );
-
-    assert_eq!(actual, "1~1");
-}

tests/filters.rs

@@ -0,0 +1,43 @@
+// use test_support::{nu, pipeline};
+// use test_support::playground::Playground;
+// use test_support::fs::Stub::FileWithContentToBeTrimmed;
+
+// #[test]
+// fn can_sum() {
+//     let actual = nu!(
+//         cwd: "tests/fixtures/formats", h::pipeline(
+//         r#"
+//             open sgml_description.json
+//             | get glossary.GlossDiv.GlossList.GlossEntry.Sections
+//             | sum
+//             | echo $it
+//         "#
+//     ));
+
+//     assert_eq!(actual, "203")
+// }
+
+// #[test]
+// fn can_average_numbers() {
+//     let actual = nu!(
+//         cwd: "tests/fixtures/formats", h::pipeline(
+//         r#"
+//             open sgml_description.json
+//             | get glossary.GlossDiv.GlossList.GlossEntry.Sections
+//             | average
+//             | echo $it
+//         "#
+//     ));
+
+//     assert_eq!(actual, "101.5000000000000")
+// }
+
+// #[test]
+// fn can_average_bytes() {
+//     let actual = nu!(
+//         cwd: "tests/fixtures/formats",
+//         "ls | sort-by name | skip 1 | first 2 | get size | average | echo $it"
+//     );
+
+//     assert_eq!(actual, "1600.000000000000");
+// }

tests/filters_test.rs

@@ -1,811 +0,0 @@
-mod helpers;
-
-use helpers as h;
-use helpers::{Playground, Stub::*};
-
-#[test]
-fn can_convert_table_to_csv_text_and_from_csv_text_back_into_table() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats",
-        "open caco3_plastics.csv | to-csv | from-csv | first 1 | get origin | echo $it"
-    );
-
-    assert_eq!(actual, "SPAIN");
-}
-
-#[test]
-fn converts_structured_table_to_csv_text() {
-    Playground::setup("filter_to_csv_test_1", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "csv_text_sample.txt",
-            r#"
-                importer,shipper,tariff_item,name,origin
-                Plasticos Rival,Reverte,2509000000,Calcium carbonate,Spain
-                Tigre Ecuador,OMYA Andina,3824909999,Calcium carbonate,Colombia
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open csv_text_sample.txt
-                | lines
-                | trim
-                | split-column "," a b c d origin
-                | last 1
-                | to-csv
-                | lines
-                | nth 1
-                | echo $it
-            "#
-        ));
-
-        assert!(actual.contains("Tigre Ecuador,OMYA Andina,3824909999,Calcium carbonate,Colombia"));
-    })
-}
-
-#[test]
-fn converts_structured_table_to_csv_text_skipping_headers_after_conversion() {
-    Playground::setup("filter_to_csv_test_2", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "csv_text_sample.txt",
-            r#"
-                importer,shipper,tariff_item,name,origin
-                Plasticos Rival,Reverte,2509000000,Calcium carbonate,Spain
-                Tigre Ecuador,OMYA Andina,3824909999,Calcium carbonate,Colombia
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open csv_text_sample.txt
-                | lines
-                | trim
-                | split-column "," a b c d origin
-                | last 1
-                | to-csv --headerless
-                | echo $it
-            "#
-        ));
-
-        assert!(actual.contains("Tigre Ecuador,OMYA Andina,3824909999,Calcium carbonate,Colombia"));
-    })
-}
-
-#[test]
-fn converts_from_csv_text_to_structured_table() {
-    Playground::setup("filter_from_csv_test_1", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "los_tres_caballeros.txt",
-            r#"
-                first_name,last_name,rusty_luck
-                Andrés,Robalino,1
-                Jonathan,Turner,1
-                Yehuda,Katz,1
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open los_tres_caballeros.txt
-                | from-csv
-                | get rusty_luck
-                | count
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "3");
-    })
-}
-
-#[test]
-fn converts_from_csv_text_with_separator_to_structured_table() {
-    Playground::setup("filter_from_csv_test_1", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "los_tres_caballeros.txt",
-            r#"
-                first_name;last_name;rusty_luck
-                Andrés;Robalino;1
-                Jonathan;Turner;1
-                Yehuda;Katz;1
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open los_tres_caballeros.txt
-                | from-csv --separator ';'
-                | get rusty_luck
-                | count
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "3");
-    })
-}
-
-#[test]
-fn converts_from_csv_text_with_tab_separator_to_structured_table() {
-    Playground::setup("filter_from_csv_test_1", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "los_tres_caballeros.txt",
-            r#"
-                first_name	last_name	rusty_luck
-                Andrés	Robalino	1
-                Jonathan	Turner	1
-                Yehuda	Katz	1
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open los_tres_caballeros.txt
-                | from-csv --separator '\t'
-                | get rusty_luck
-                | count
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "3");
-    })
-}
-
-#[test]
-fn converts_from_csv_text_skipping_headers_to_structured_table() {
-    Playground::setup("filter_from_csv_test_2", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "los_tres_amigos.txt",
-            r#"
-                Andrés,Robalino,1
-                Jonathan,Turner,1
-                Yehuda,Katz,1
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open los_tres_amigos.txt
-                | from-csv --headerless
-                | get Column3
-                | count
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "3");
-    })
-}
-
-#[test]
-fn can_convert_table_to_json_text_and_from_json_text_back_into_table() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
-        r#"
-            open sgml_description.json
-            | to-json
-            | from-json
-            | get glossary.GlossDiv.GlossList.GlossEntry.GlossSee
-            | echo $it
-        "#
-    ));
-
-    assert_eq!(actual, "markup");
-}
-
-#[test]
-fn converts_from_json_text_to_structured_table() {
-    Playground::setup("filter_from_json_test_1", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "katz.txt",
-            r#"
-                {
-                    "katz": [
-                        {"name":   "Yehuda", "rusty_luck": 1},
-                        {"name": "Jonathan", "rusty_luck": 1},
-                        {"name":   "Andres", "rusty_luck": 1},
-                        {"name":"GorbyPuff", "rusty_luck": 1}
-                    ]
-                }
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(),
-            "open katz.txt | from-json | get katz | get rusty_luck | count | echo $it"
-        );
-
-        assert_eq!(actual, "4");
-    })
-}
-
-#[test]
-fn converts_from_json_text_recognizing_objects_independendtly_to_structured_table() {
-    Playground::setup("filter_from_json_test_2", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "katz.txt",
-            r#"
-                {"name":   "Yehuda", "rusty_luck": 1}
-                {"name": "Jonathan", "rusty_luck": 1}
-                {"name":   "Andres", "rusty_luck": 1}
-                {"name":"GorbyPuff", "rusty_luck": 3}
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open katz.txt
-                | from-json --objects
-                | where name == "GorbyPuff"
-                | get rusty_luck
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "3");
-    })
-}
-
-#[test]
-fn converts_structured_table_to_json_text() {
-    Playground::setup("filter_to_json_test", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "sample.txt",
-            r#"
-                JonAndrehudaTZ,3
-                GorbyPuff,100
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open sample.txt
-                | lines
-                | split-column "," name luck
-                | pick name
-                | to-json
-                | from-json
-                | nth 0
-                | get name
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "JonAndrehudaTZ");
-    })
-}
-
-#[test]
-fn can_convert_table_to_tsv_text_and_from_tsv_text_back_into_table() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats",
-        "open caco3_plastics.tsv | to-tsv | from-tsv | first 1 | get origin | echo $it"
-    );
-
-    assert_eq!(actual, "SPAIN");
-}
-
-#[test]
-fn can_convert_table_to_tsv_text_and_from_tsv_text_back_into_table_using_csv_separator() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats",
-        r"open caco3_plastics.tsv | to-tsv | from-csv --separator '\t' | first 1 | get origin | echo $it"
-    );
-
-    assert_eq!(actual, "SPAIN");
-}
-
-#[test]
-fn converts_structured_table_to_tsv_text() {
-    Playground::setup("filter_to_tsv_test_1", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "tsv_text_sample.txt",
-            r#"
-                importer	shipper	tariff_item	name	origin
-                Plasticos Rival	Reverte	2509000000	Calcium carbonate	Spain
-                Tigre Ecuador	OMYA Andina	3824909999	Calcium carbonate	Colombia
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open tsv_text_sample.txt
-                | lines
-                | split-column "\t" a b c d origin
-                | last 1
-                | to-tsv
-                | lines
-                | nth 1
-                | echo $it
-            "#
-        ));
-
-        assert!(actual.contains("Colombia"));
-    })
-}
-
-#[test]
-fn converts_structured_table_to_tsv_text_skipping_headers_after_conversion() {
-    Playground::setup("filter_to_tsv_test_2", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "tsv_text_sample.txt",
-            r#"
-                importer    shipper tariff_item name    origin
-                Plasticos Rival Reverte 2509000000  Calcium carbonate   Spain
-                Tigre Ecuador   OMYA Andina 3824909999  Calcium carbonate   Colombia
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open tsv_text_sample.txt
-                | lines
-                | split-column "\t" a b c d origin
-                | last 1
-                | to-tsv --headerless
-                | echo $it
-            "#
-        ));
-
-        assert!(actual.contains("Colombia"));
-    })
-}
-
-#[test]
-fn converts_from_tsv_text_to_structured_table() {
-    Playground::setup("filter_from_tsv_test_1", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "los_tres_amigos.txt",
-            r#"
-                first Name	Last Name	rusty_luck
-                Andrés	Robalino	1
-                Jonathan	Turner	1
-                Yehuda	Katz	1
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open los_tres_amigos.txt
-                | from-tsv
-                | get rusty_luck
-                | count
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "3");
-    })
-}
-
-#[test]
-fn converts_from_tsv_text_skipping_headers_to_structured_table() {
-    Playground::setup("filter_from_tsv_test_2", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "los_tres_amigos.txt",
-            r#"
-                Andrés	Robalino	1
-                Jonathan	Turner	1
-                Yehuda	Katz	1
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open los_tres_amigos.txt
-                | from-tsv --headerless
-                | get Column3
-                | count
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "3");
-    })
-}
-
-#[test]
-fn converts_from_ssv_text_to_structured_table() {
-    Playground::setup("filter_from_ssv_test_1", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "oc_get_svc.txt",
-            r#"
-                NAME              LABELS                                    SELECTOR                  IP              PORT(S)
-                docker-registry   docker-registry=default                   docker-registry=default   172.30.78.158   5000/TCP
-                kubernetes        component=apiserver,provider=kubernetes   <none>                    172.30.0.2      443/TCP
-                kubernetes-ro     component=apiserver,provider=kubernetes   <none>                    172.30.0.1      80/TCP
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open oc_get_svc.txt
-                | from-ssv
-                | nth 0
-                | get IP
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "172.30.78.158");
-    })
-}
-
-#[test]
-fn converts_from_ssv_text_to_structured_table_with_separator_specified() {
-    Playground::setup("filter_from_ssv_test_1", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "oc_get_svc.txt",
-            r#"
-                NAME              LABELS                                    SELECTOR                  IP              PORT(S)
-                docker-registry   docker-registry=default                   docker-registry=default   172.30.78.158   5000/TCP
-                kubernetes        component=apiserver,provider=kubernetes   <none>                    172.30.0.2      443/TCP
-                kubernetes-ro     component=apiserver,provider=kubernetes   <none>                    172.30.0.1      80/TCP
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open oc_get_svc.txt
-                | from-ssv --minimum-spaces 3
-                | nth 0
-                | get IP
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "172.30.78.158");
-    })
-}
-
-#[test]
-fn converts_from_ssv_text_treating_first_line_as_data_with_flag() {
-    Playground::setup("filter_from_ssv_test_2", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "oc_get_svc.txt",
-            r#"
-                docker-registry   docker-registry=default                   docker-registry=default   172.30.78.158   5000/TCP
-                kubernetes        component=apiserver,provider=kubernetes   <none>                    172.30.0.2      443/TCP
-                kubernetes-ro     component=apiserver,provider=kubernetes   <none>                    172.30.0.1      80/TCP
-            "#,
-        )]);
-
-        let aligned_columns = nu!(
-        cwd: dirs.test(), h::pipeline(
-            r#"
-                open oc_get_svc.txt
-                | from-ssv --headerless --aligned-columns
-                | first
-                | get Column1
-                | echo $it
-            "#
-        ));
-
-        let separator_based = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open oc_get_svc.txt
-                | from-ssv --headerless
-                | first
-                | get Column1
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(aligned_columns, separator_based);
-        assert_eq!(separator_based, "docker-registry");
-    })
-}
-
-#[test]
-fn can_convert_table_to_bson_and_back_into_table() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
-        r#"
-            open sample.bson
-            | to-bson
-            | from-bson
-            | get root
-            | get 1.b
-            | echo $it
-        "#
-    ));
-
-    assert_eq!(actual, "whel");
-}
-
-#[test]
-fn can_read_excel_file() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
-        r#"
-            open sample_data.xlsx
-            | get SalesOrders
-            | nth 4
-            | get Column2
-            | echo $it
-        "#
-    ));
-
-    assert_eq!(actual, "Gill");
-}
-
-#[test]
-fn can_convert_table_to_sqlite_and_back_into_table() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
-        r#"
-            open sample.db
-            | to-sqlite
-            | from-sqlite
-            | get table_values
-            | nth 2
-            | get x
-            | echo $it
-        "#
-    ));
-
-    assert_eq!(actual, "hello");
-}
-
-#[test]
-fn can_convert_table_to_toml_text_and_from_toml_text_back_into_table() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
-        r#"
-            open cargo_sample.toml
-            | to-toml
-            | from-toml
-            | get package.name
-            | echo $it
-        "#
-    ));
-
-    assert_eq!(actual, "nu");
-}
-
-#[test]
-fn can_convert_table_to_yaml_text_and_from_yaml_text_back_into_table() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
-        r#"
-            open appveyor.yml
-            | to-yaml
-            | from-yaml
-            | get environment.global.PROJECT_NAME
-            | echo $it
-        "#
-    ));
-
-    assert_eq!(actual, "nushell");
-}
-
-#[test]
-fn can_encode_and_decode_urlencoding() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
-            r#"
-                open sample.url
-                | to-url
-                | from-url
-                | get cheese
-                | echo $it
-            "#
-    ));
-
-    assert_eq!(actual, "comté");
-}
-
-#[test]
-fn can_sort_by_column() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
-        r#"
-            open cargo_sample.toml --raw
-            | lines
-            | skip 1
-            | first 4
-            | split-column "="
-            | sort-by Column1
-            | skip 1
-            | first 1
-            | get Column1
-            | trim
-            | echo $it
-        "#
-    ));
-
-    assert_eq!(actual, "description");
-}
-
-#[test]
-fn can_split_by_column() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
-        r#"
-            open cargo_sample.toml --raw
-            | lines
-            | skip 1
-            | first 1
-            | split-column "="
-            | get Column1
-            | trim
-            | echo $it
-        "#
-    ));
-
-    assert_eq!(actual, "name");
-}
-
-// #[test]
-// fn can_sum() {
-//     let actual = nu!(
-//         cwd: "tests/fixtures/formats", h::pipeline(
-//         r#"
-//             open sgml_description.json
-//             | get glossary.GlossDiv.GlossList.GlossEntry.Sections
-//             | sum
-//             | echo $it
-//         "#
-//     ));
-
-//     assert_eq!(actual, "203")
-// }
-
-// #[test]
-// fn can_average_numbers() {
-//     let actual = nu!(
-//         cwd: "tests/fixtures/formats", h::pipeline(
-//         r#"
-//             open sgml_description.json
-//             | get glossary.GlossDiv.GlossList.GlossEntry.Sections
-//             | average
-//             | echo $it
-//         "#
-//     ));
-
-//     assert_eq!(actual, "101.5000000000000")
-// }
-
-// #[test]
-// fn can_average_bytes() {
-//     let actual = nu!(
-//         cwd: "tests/fixtures/formats",
-//         "ls | sort-by name | skip 1 | first 2 | get size | average | echo $it"
-//     );
-
-//     assert_eq!(actual, "1600.000000000000");
-// }
-
-#[test]
-fn can_filter_by_unit_size_comparison() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats",
-        "ls | where size > 1kb | sort-by size | get name | first 1 | trim | echo $it"
-    );
-
-    assert_eq!(actual, "cargo_sample.toml");
-}
-
-#[test]
-fn can_get_last() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats",
-        "ls | sort-by name | last 1 | get name | trim | echo $it"
-    );
-
-    assert_eq!(actual, "utf16.ini");
-}
-
-#[test]
-fn can_get_reverse_first() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats",
-        "ls | sort-by name | reverse | first 1 | get name | trim | echo $it"
-    );
-
-    assert_eq!(actual, "utf16.ini");
-}
-
-#[test]
-fn wrap_rows_into_a_row() {
-    Playground::setup("embed_test_1", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "los_tres_caballeros.txt",
-            r#"
-                first_name,last_name
-                Andrés,Robalino
-                Jonathan,Turner
-                Yehuda,Katz
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open los_tres_caballeros.txt
-                | from-csv
-                | wrap caballeros
-                | get caballeros
-                | nth 0
-                | get last_name
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "Robalino");
-    })
-}
-
-#[test]
-fn wrap_rows_into_a_table() {
-    Playground::setup("embed_test_2", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "los_tres_caballeros.txt",
-            r#"
-                first_name,last_name
-                Andrés,Robalino
-                Jonathan,Turner
-                Yehuda,Katz
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open los_tres_caballeros.txt
-                | from-csv
-                | get last_name
-                | wrap caballero
-                | nth 2
-                | get caballero
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "Katz");
-    })
-}
-
-#[test]
-fn get() {
-    Playground::setup("get_test", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "los_tres_caballeros.txt",
-            r#"
-                first_name,last_name
-                Andrés,Robalino
-                Jonathan,Turner
-                Yehuda,Katz
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
-            r#"
-                open los_tres_caballeros.txt
-                | from-csv
-                | nth 1
-                | get last_name
-                | echo $it
-            "#
-        ));
-
-        assert_eq!(actual, "Turner");
-    })
-}

tests/helpers/mod.rs

@@ -1,450 +0,0 @@
-#![allow(dead_code)]
-
-use glob::glob;
-pub use std::path::Path;
-pub use std::path::PathBuf;
-
-use app_dirs::{get_app_root, AppDataType};
-use getset::Getters;
-use nu_source::PrettyDebug;
-use std::io::Read;
-use tempfile::{tempdir, TempDir};
-
-pub trait DisplayPath {
-    fn display_path(&self) -> String;
-}
-
-impl DisplayPath for PathBuf {
-    fn display_path(&self) -> String {
-        self.display().to_string()
-    }
-}
-
-impl DisplayPath for str {
-    fn display_path(&self) -> String {
-        self.to_string()
-    }
-}
-
-impl DisplayPath for &str {
-    fn display_path(&self) -> String {
-        self.to_string()
-    }
-}
-
-impl DisplayPath for String {
-    fn display_path(&self) -> String {
-        self.clone()
-    }
-}
-
-impl DisplayPath for &String {
-    fn display_path(&self) -> String {
-        self.to_string()
-    }
-}
-
-impl DisplayPath for nu::AbsolutePath {
-    fn display_path(&self) -> String {
-        self.display()
-    }
-}
-
-#[macro_export]
-macro_rules! nu {
-    (cwd: $cwd:expr, $path:expr, $($part:expr),*) => {{
-        use $crate::helpers::DisplayPath;
-
-        let path = format!($path, $(
-            $part.display_path()
-        ),*);
-
-        nu!($cwd, &path)
-    }};
-
-    (cwd: $cwd:expr, $path:expr) => {{
-        nu!($cwd, $path)
-    }};
-
-    ($cwd:expr, $path:expr) => {{
-        pub use std::error::Error;
-        pub use std::io::prelude::*;
-        pub use std::process::{Command, Stdio};
-
-        let commands = &*format!(
-            "
-                            cd {}
-                            {}
-                            exit",
-            $crate::helpers::in_directory($cwd),
-            $crate::helpers::DisplayPath::display_path(&$path)
-        );
-
-        let mut process = match Command::new(helpers::executable_path())
-            .stdin(Stdio::piped())
-            .stdout(Stdio::piped())
-            .spawn()
-        {
-            Ok(child) => child,
-            Err(why) => panic!("Can't run test {}", why.description()),
-        };
-
-        let stdin = process.stdin.as_mut().expect("couldn't open stdin");
-        stdin
-            .write_all(commands.as_bytes())
-            .expect("couldn't write to stdin");
-
-
-        let output = process
-            .wait_with_output()
-            .expect("couldn't read from stdout");
-
-        let out = String::from_utf8_lossy(&output.stdout);
-        let out = out.replace("\r\n", "");
-        let out = out.replace("\n", "");
-        out
-    }};
-}
-
-#[macro_export]
-macro_rules! nu_error {
-    (cwd: $cwd:expr, $path:expr, $($part:expr),*) => {{
-        use $crate::helpers::DisplayPath;
-
-        let path = format!($path, $(
-            $part.display_path()
-        ),*);
-
-        nu_error!($cwd, &path)
-    }};
-
-    (cwd: $cwd:expr, $path:expr) => {{
-        nu_error!($cwd, $path)
-    }};
-
-    ($cwd:expr, $path:expr) => {{
-        pub use std::error::Error;
-        pub use std::io::prelude::*;
-        pub use std::process::{Command, Stdio};
-
-        let commands = &*format!(
-            "
-                            cd {}
-                            {}
-                            exit",
-            $crate::helpers::in_directory($cwd),
-            $crate::helpers::DisplayPath::display_path(&$path)
-        );
-
-        let mut process = Command::new(helpers::executable_path())
-            .stdin(Stdio::piped())
-            .stderr(Stdio::piped())
-            .spawn()
-            .expect("couldn't run test");
-
-        let stdin = process.stdin.as_mut().expect("couldn't open stdin");
-        stdin
-            .write_all(commands.as_bytes())
-            .expect("couldn't write to stdin");
-
-        let output = process
-            .wait_with_output()
-            .expect("couldn't read from stderr");
-
-        let out = String::from_utf8_lossy(&output.stderr);
-        out.into_owned()
-    }};
-}
-
-#[macro_export]
-macro_rules! nu_combined {
-    (cwd: $cwd:expr, $path:expr, $($part:expr),*) => {{
-        use $crate::helpers::DisplayPath;
-
-        let path = format!($path, $(
-            $part.display_path()
-        ),*);
-
-        nu_combined!($cwd, &path)
-    }};
-
-    (cwd: $cwd:expr, $path:expr) => {{
-        nu_combined!($cwd, $path)
-    }};
-
-    ($cwd:expr, $path:expr) => {{
-        pub use std::error::Error;
-        pub use std::io::prelude::*;
-        pub use std::process::{Command, Stdio};
-
-        let commands = &*format!(
-            "
-                            cd {}
-                            {}
-                            exit",
-            $crate::helpers::in_directory($cwd),
-            $crate::helpers::DisplayPath::display_path(&$path)
-        );
-
-        let mut process = Command::new(helpers::executable_path())
-            .stdin(Stdio::piped())
-            .stdout(Stdio::piped())
-            .stderr(Stdio::piped())
-            .spawn()
-            .expect("couldn't run test");
-
-        let stdin = process.stdin.as_mut().expect("couldn't open stdin");
-        stdin
-            .write_all(commands.as_bytes())
-            .expect("couldn't write to stdin");
-
-        let output = process
-            .wait_with_output()
-            .expect("couldn't read from stdout/stderr");
-
-        let err = String::from_utf8_lossy(&output.stderr).into_owned();
-        let out = String::from_utf8_lossy(&output.stdout).into_owned();
-        let out = out.replace("\r\n", "");
-        let out = out.replace("\n", "");
-        (out, err)
-    }};
-}
-
-pub enum Stub<'a> {
-    FileWithContent(&'a str, &'a str),
-    FileWithContentToBeTrimmed(&'a str, &'a str),
-    EmptyFile(&'a str),
-}
-
-pub struct Playground {
-    root: TempDir,
-    tests: String,
-    cwd: PathBuf,
-}
-
-#[derive(Getters)]
-#[get = "pub"]
-pub struct Dirs {
-    pub root: PathBuf,
-    pub test: PathBuf,
-    pub fixtures: PathBuf,
-}
-
-impl Dirs {
-    pub fn formats(&self) -> PathBuf {
-        PathBuf::from(self.fixtures.join("formats"))
-    }
-
-    pub fn config_path(&self) -> PathBuf {
-        get_app_root(AppDataType::UserConfig, &nu::APP_INFO).unwrap()
-    }
-}
-
-impl Playground {
-    pub fn root(&self) -> &Path {
-        self.root.path()
-    }
-
-    pub fn back_to_playground(&mut self) -> &mut Self {
-        self.cwd = PathBuf::from(self.root()).join(self.tests.clone());
-        self
-    }
-
-    pub fn setup(topic: &str, block: impl FnOnce(Dirs, &mut Playground)) {
-        let root = tempdir().expect("Couldn't create a tempdir");
-        let nuplay_dir = root.path().join(topic);
-
-        if PathBuf::from(&nuplay_dir).exists() {
-            std::fs::remove_dir_all(PathBuf::from(&nuplay_dir)).expect("can not remove directory");
-        }
-
-        std::fs::create_dir(PathBuf::from(&nuplay_dir)).expect("can not create directory");
-
-        let mut playground = Playground {
-            root: root,
-            tests: topic.to_string(),
-            cwd: nuplay_dir,
-        };
-
-        let project_root = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
-        let playground_root = playground.root.path();
-
-        let fixtures = project_root.join(file!());
-        let fixtures = fixtures
-            .parent()
-            .expect("Couldn't find the fixtures directory")
-            .parent()
-            .expect("Couldn't find the fixtures directory")
-            .join("fixtures");
-
-        let fixtures = dunce::canonicalize(fixtures.clone()).expect(&format!(
-            "Couldn't canonicalize fixtures path {}",
-            fixtures.display()
-        ));
-
-        let test =
-            dunce::canonicalize(PathBuf::from(playground_root.join(topic))).expect(&format!(
-                "Couldn't canonicalize test path {}",
-                playground_root.join(topic).display()
-            ));
-
-        let root = dunce::canonicalize(playground_root).expect(&format!(
-            "Couldn't canonicalize tests root path {}",
-            playground_root.display()
-        ));
-
-        let dirs = Dirs {
-            root,
-            test,
-            fixtures,
-        };
-
-        block(dirs, &mut playground);
-    }
-
-    pub fn mkdir(&mut self, directory: &str) -> &mut Self {
-        self.cwd.push(directory);
-        std::fs::create_dir_all(&self.cwd).expect("can not create directory");
-        self.back_to_playground();
-        self
-    }
-
-    pub fn with_files(&mut self, files: Vec<Stub>) -> &mut Self {
-        let endl = line_ending();
-
-        files
-            .iter()
-            .map(|f| {
-                let mut path = PathBuf::from(&self.cwd);
-
-                let (file_name, contents) = match *f {
-                    Stub::EmptyFile(name) => (name, "fake data".to_string()),
-                    Stub::FileWithContent(name, content) => (name, content.to_string()),
-                    Stub::FileWithContentToBeTrimmed(name, content) => (
-                        name,
-                        content
-                            .lines()
-                            .skip(1)
-                            .map(|line| line.trim())
-                            .collect::<Vec<&str>>()
-                            .join(&endl),
-                    ),
-                };
-
-                path.push(file_name);
-
-                std::fs::write(PathBuf::from(path), contents.as_bytes())
-                    .expect("can not create file");
-            })
-            .for_each(drop);
-        self.back_to_playground();
-        self
-    }
-
-    pub fn within(&mut self, directory: &str) -> &mut Self {
-        self.cwd.push(directory);
-        std::fs::create_dir(&self.cwd).expect("can not create directory");
-        self
-    }
-
-    pub fn glob_vec(pattern: &str) -> Vec<PathBuf> {
-        let glob = glob(pattern);
-
-        match glob {
-            Ok(paths) => paths
-                .map(|path| {
-                    if let Ok(path) = path {
-                        path
-                    } else {
-                        unreachable!()
-                    }
-                })
-                .collect(),
-            Err(_) => panic!("Invalid pattern."),
-        }
-    }
-}
-
-pub fn file_contents(full_path: impl AsRef<Path>) -> String {
-    let mut file = std::fs::File::open(full_path.as_ref()).expect("can not open file");
-    let mut contents = String::new();
-    file.read_to_string(&mut contents)
-        .expect("can not read file");
-    contents
-}
-
-pub fn file_contents_binary(full_path: impl AsRef<Path>) -> Vec<u8> {
-    let mut file = std::fs::File::open(full_path.as_ref()).expect("can not open file");
-    let mut contents = Vec::new();
-    file.read_to_end(&mut contents).expect("can not read file");
-    contents
-}
-
-pub fn line_ending() -> String {
-    #[cfg(windows)]
-    {
-        String::from("\r\n")
-    }
-
-    #[cfg(not(windows))]
-    {
-        String::from("\n")
-    }
-}
-
-pub fn delete_file_at(full_path: impl AsRef<Path>) {
-    let full_path = full_path.as_ref();
-
-    if full_path.exists() {
-        std::fs::remove_file(full_path).expect("can not delete file");
-    }
-}
-
-pub fn create_file_at(full_path: impl AsRef<Path>) -> Result<(), std::io::Error> {
-    let full_path = full_path.as_ref();
-
-    if let Some(parent) = full_path.parent() {
-        panic!(format!("{:?} exists", parent.display()));
-    }
-
-    std::fs::write(full_path, "fake data".as_bytes())
-}
-
-pub fn copy_file_to(source: &str, destination: &str) {
-    std::fs::copy(source, destination).expect("can not copy file");
-}
-
-pub fn files_exist_at(files: Vec<impl AsRef<Path>>, path: impl AsRef<Path>) -> bool {
-    files.iter().all(|f| {
-        let mut loc = PathBuf::from(path.as_ref());
-        loc.push(f);
-        loc.exists()
-    })
-}
-
-pub fn delete_directory_at(full_path: &str) {
-    std::fs::remove_dir_all(PathBuf::from(full_path)).expect("can not remove directory");
-}
-
-pub fn executable_path() -> PathBuf {
-    let mut buf = PathBuf::new();
-    buf.push("target");
-    buf.push("debug");
-    buf.push("nu");
-    buf
-}
-
-pub fn in_directory(str: impl AsRef<Path>) -> String {
-    str.as_ref().display().to_string()
-}
-
-pub fn pipeline(commands: &str) -> String {
-    commands
-        .lines()
-        .skip(1)
-        .map(|line| line.trim())
-        .collect::<Vec<&str>>()
-        .join(" ")
-        .trim_end()
-        .to_string()
-}

tests/main.rs

@@ -0,0 +1,6 @@
+extern crate test_support;
+
+mod commands;
+mod converting_formats;
+mod plugins;
+mod shell;

tests/plugins/core_inc.rs

@@ -1,6 +1,6 @@
-mod helpers;
-
-use helpers::{Playground, Stub::*};
+use test_support::fs::Stub::FileWithContent;
+use test_support::playground::Playground;
+use test_support::{nu, nu_error};
 
 #[test]
 fn can_only_apply_one() {

tests/plugins/core_str.rs

@@ -1,7 +1,6 @@
-mod helpers;
-
-use h::{Playground, Stub::*};
-use helpers as h;
+use test_support::fs::Stub::FileWithContent;
+use test_support::playground::Playground;
+use test_support::{nu, nu_error, pipeline};
 
 #[test]
 fn can_only_apply_one() {
@@ -77,7 +76,7 @@ fn upcases() {
 #[test]
 fn converts_to_int() {
     let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
+        cwd: "tests/fixtures/formats", pipeline(
         r#"
             open caco3_plastics.csv
             | first 1
@@ -103,7 +102,7 @@ fn replaces() {
         )]);
 
         let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
+            cwd: dirs.test(), pipeline(
             r#"
                  open sample.toml
                  | str package.name --replace wykittenshell
@@ -128,7 +127,7 @@ fn find_and_replaces() {
         )]);
 
         let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
+            cwd: dirs.test(), pipeline(
             r#"
                  open sample.toml
                  | str fortune.teller.phone --find-replace [KATZ "5289"]
@@ -153,7 +152,7 @@ fn find_and_replaces_without_passing_field() {
         )]);
 
         let actual = nu!(
-            cwd: dirs.test(), h::pipeline(
+            cwd: dirs.test(), pipeline(
             r#"
                  open sample.toml
                  | get fortune.teller.phone

tests/plugins/mod.rs

@@ -0,0 +1,2 @@
+mod core_inc;
+mod core_str;

tests/shell/mod.rs

@@ -0,0 +1,32 @@
+mod pipeline {
+    use test_support::fs::Stub::FileWithContent;
+    use test_support::playground::Playground;
+    use test_support::{nu_combined, pipeline};
+
+    #[test]
+    fn it_arg_works_with_many_inputs_to_external_command() {
+        Playground::setup("it_arg_works_with_many_inputs", |dirs, sandbox| {
+            sandbox.with_files(vec![
+                FileWithContent("file1", "text"),
+                FileWithContent("file2", " and more text"),
+            ]);
+
+            let (stdout, stderr) = nu_combined!(
+                cwd: dirs.test(), pipeline(
+                r#"
+                    echo hello world
+                    | split-row " "
+                    | ^echo $it
+                "#
+            ));
+
+            #[cfg(windows)]
+            assert_eq!("hello world", stdout);
+
+            #[cfg(not(windows))]
+            assert_eq!("helloworld", stdout);
+
+            assert!(!stderr.contains("No such file or directory"));
+        })
+    }
+}

tests/tests.rs

@@ -1,135 +0,0 @@
-mod helpers;
-
-use helpers as h;
-
-#[test]
-fn pipeline_helper() {
-    let actual = h::pipeline(
-        r#"
-            open los_tres_amigos.txt
-            | from-csv
-            | get rusty_luck
-            | str --to-int
-            | sum
-            | echo "$it"
-        "#,
-    );
-
-    assert_eq!(
-        actual,
-        r#"open los_tres_amigos.txt | from-csv | get rusty_luck | str --to-int | sum | echo "$it""#
-    );
-}
-
-#[test]
-fn external_num() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats",
-        "open sgml_description.json | get glossary.GlossDiv.GlossList.GlossEntry.Height | echo $it"
-    );
-
-    assert_eq!(actual, "10");
-}
-
-#[test]
-fn external_has_correct_quotes() {
-    let actual = nu!(
-        cwd: ".",
-        r#"echo "hello world""#
-    );
-
-    assert_eq!(actual, r#"hello world"#);
-}
-
-#[test]
-fn insert_plugin() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
-        r#"
-            open cargo_sample.toml
-            | insert dev-dependencies.newdep "1"
-            | get dev-dependencies.newdep
-            | echo $it
-        "#
-    ));
-
-    assert_eq!(actual, "1");
-}
-
-#[test]
-fn parse_plugin() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
-        r#"
-            open fileA.txt
-            | parse "{Name}={Value}"
-            | nth 1
-            | get Value
-            | echo $it
-        "#
-    ));
-
-    assert_eq!(actual, "StupidLongName");
-}
-
-#[test]
-fn format_plugin() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
-        r#"
-        open cargo_sample.toml
-            | get package
-            | format "{name} has license {license}"
-            | echo $it
-        "#
-    ));
-
-    assert_eq!(actual, "nu has license ISC");
-}
-
-#[test]
-fn prepend_plugin() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
-        r#"
-            open fileA.txt
-            | lines
-            | prepend "testme"
-            | nth 0
-            | echo $it
-        "#
-    ));
-
-    assert_eq!(actual, "testme");
-}
-
-#[test]
-fn append_plugin() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
-        r#"
-            open fileA.txt
-            | lines
-            | append "testme"
-            | nth 3
-            | echo $it
-        "#
-    ));
-
-    assert_eq!(actual, "testme");
-}
-
-#[test]
-fn edit_plugin() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats", h::pipeline(
-        r#"
-            open cargo_sample.toml
-            | edit dev-dependencies.pretty_assertions "7"
-            | get dev-dependencies.pretty_assertions
-            | echo $it
-        "#
-    ));
-
-    assert_eq!(actual, "7");
-}